using System;
using System.Data;
using System.Xml;
using System.Data.SqlClient;
using System.Collections;
using System.Configuration;

/// <summary>
/// The SqlHelper class is intended to encapsulate high performance, scalable best practices for 
/// common uses of SqlClient
/// </summary>
public sealed class SqlHelper
{
        #region private utility methods & constructors

        // Since this class provides only static methods, make the default constructor private to prevent 
        // instances from being created with "new SqlHelper()"
        private SqlHelper()
        {

           
        }

        public static string CONSTRING = System.Configuration.ConfigurationManager.ConnectionStrings["HFReader.Properties.Settings.E__C__ENABLE_门禁_DATABASE_MDFConnectionString"].ConnectionString;

      //  public static string CONSTRING = @"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\database.mdf;Integrated Security=True;User Instance=True";
                //ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;

        /// <summary>
        /// This method is used to attach array of SqlParameters to a SqlCommand.
        /// 
        /// This method will assign a value of DbNull to any parameter with a direction of
        /// InputOutput and a value of null.  
        /// 
        /// This behavior will prevent default values from being used, but
        /// this will be the less common case than an intended pure output parameter (derived as InputOutput)
        /// where the user provided no input value.
        /// </summary>
        /// <param name="command">The command to which the parameters will be added</param>
        /// <param name="commandParameters">An array of SqlParameters to be added to command</param>
        private static void AttachParameters(SqlCommand command, SqlParameter[] commandParameters)
        {
                if (command == null) throw new ArgumentNullException("command");
                if (commandParameters != null)
                {
                        foreach (SqlParameter p in commandParameters)
                        {
                                if (p != null)
                                {
                                        // Check for derived output value with no value assigned
                                        if ((p.Direction == ParameterDirection.InputOutput ||
                                            p.Direction == ParameterDirection.Input) &&
                                            (p.Value == null))
                                        {
                                                p.Value = DBNull.Value;
                                        }
                                        command.Parameters.Add(p);
                                }
                        }
                }
        }

        /// <summary>
        /// This method assigns dataRow column values to an array of SqlParameters
        /// </summary>
        /// <param name="commandParameters">Array of SqlParameters to be assigned values</param>
        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values</param>
        private static void AssignParameterValues(SqlParameter[] commandParameters, DataRow dataRow)
        {
                if ((commandParameters == null) || (dataRow == null))
                {
                        // Do nothing if we get no data
                        return;
                }

                int i = 0;
                // Set the parameters values
                foreach (SqlParameter commandParameter in commandParameters)
                {
                        // Check the parameter name
                        if (commandParameter.ParameterName == null ||
                            commandParameter.ParameterName.Length <= 1)
                                throw new Exception(
                                    string.Format(
                                        "Please provide a valid parameter name on the parameter #{0}, the ParameterName property has the following value: '{1}'.",
                                        i, commandParameter.ParameterName));
                        if (dataRow.Table.Columns.IndexOf(commandParameter.ParameterName.Substring(1)) != -1)
                                commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)];
                        i++;
                }
        }

        /// <summary>
        /// This method assigns an array of values to an array of SqlParameters
        /// </summary>
        /// <param name="commandParameters">Array of SqlParameters to be assigned values</param>
        /// <param name="parameterValues">Array of objects holding the values to be assigned</param>
        private static void AssignParameterValues(SqlParameter[] commandParameters, object[] parameterValues)
        {
                if ((commandParameters == null) || (parameterValues == null))
                {
                        // Do nothing if we get no data
                        return;
                }

                // We must have the same number of values as we pave parameters to put them in
                if (commandParameters.Length != parameterValues.Length)
                {
                        throw new ArgumentException("Parameter count does not match Parameter Value count.");
                }

                // Iterate through the SqlParameters, assigning the values from the corresponding position in the 
                // value array
                for (int i = 0, j = commandParameters.Length; i < j; i++)
                {
                        // If the current array value derives from IDbDataParameter, then assign its Value property
                        if (parameterValues[i] is IDbDataParameter)
                        {
                                IDbDataParameter paramInstance = (IDbDataParameter)parameterValues[i];
                                if (paramInstance.Value == null)
                                {
                                        commandParameters[i].Value = DBNull.Value;
                                }
                                else
                                {
                                        commandParameters[i].Value = paramInstance.Value;
                                }
                        }
                        else if (parameterValues[i] == null)
                        {
                                commandParameters[i].Value = DBNull.Value;
                        }
                        else
                        {
                                commandParameters[i].Value = parameterValues[i];
                        }
                }
        }

        /// <summary>
        /// This method opens (if necessary) and assigns a connection, transaction, command type and parameters 
        /// to the provided command
        /// </summary>
        /// <param name="command">The SqlCommand to be prepared</param>
        /// <param name="connection">A valid SqlConnection, on which to execute this command</param>
        /// <param name="transaction">A valid SqlTransaction, or 'null'</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">An array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>
        /// <param name="mustCloseConnection"><c>true</c> if the connection was opened by the method, otherwose is false.</param>
        private static void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, out bool mustCloseConnection)
        {
                if (command == null) throw new ArgumentNullException("command");
                if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");

                // If the provided connection is not open, we will open it
                if (connection.State != ConnectionState.Open)
                {
                        mustCloseConnection = true;
                        connection.Open();
                }
                else
                {
                        mustCloseConnection = false;
                }

                // Associate the connection with the command
                command.Connection = connection;

                // Set the command text (stored procedure name or SQL statement)
                command.CommandText = commandText;

                // If we were provided a transaction, assign it
                if (transaction != null)
                {
                        if (transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
                        command.Transaction = transaction;
                }

                // Set the command type
                command.CommandType = commandType;

                // Attach the command parameters if they are provided
                if (commandParameters != null)
                {
                        AttachParameters(command, commandParameters);
                }
                return;
        }

        #endregion private utility methods & constructors

        #region ExecuteNonQuery

        /// <summary>
        /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the database specified in 
        /// the connection string
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)
        {
                // Pass through the call providing null for the set of SqlParameters
                return ExecuteNonQuery(connectionString, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns no resultset) against the database specified in the connection string 
        /// using the provided parameters
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
                if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

                // Create & open a SqlConnection, and dispose of it after we are done
                using (SqlConnection connection = new SqlConnection(connectionString))
                {
                        connection.Open();

                        // Call the overload that takes a connection in place of the connection string
                        return ExecuteNonQuery(connection, commandType, commandText, commandParameters);
                }
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in 
        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="spName">The name of the stored prcedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)
        {
                if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If we receive parameter values, we need to figure out where they go
                if ((parameterValues != null) && (parameterValues.Length > 0))
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                        // Assign the provided values to these parameters based on parameter order
                        AssignParameterValues(commandParameters, parameterValues);

                        // Call the overload that takes an array of SqlParameters
                        return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        // Otherwise we can just call the SP without params
                        return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
                }
        }

        /// <summary>
        /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlConnection. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");
        /// </remarks>
        /// <param name="connection">A valid SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText)
        {
                // Pass through the call providing null for the set of SqlParameters
                return ExecuteNonQuery(connection, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns no resultset) against the specified SqlConnection 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection">A valid SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
                if (connection == null) throw new ArgumentNullException("connection");

                // Create a command and prepare it for execution
                SqlCommand cmd = new SqlCommand();
                bool mustCloseConnection = false;
                PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);

                // Finally, execute the command
                int retval;
                try
                {
                        retval = cmd.ExecuteNonQuery();
                }
                catch(Exception ex)
                { return 0; }
                // Detach the SqlParameters from the command object, so they can be used again
                cmd.Parameters.Clear();
                if (mustCloseConnection)
                        connection.Close();
                return retval;
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified SqlConnection 
        /// using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);
        /// </remarks>
        /// <param name="connection">A valid SqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(SqlConnection connection, string spName, params object[] parameterValues)
        {
                if (connection == null) throw new ArgumentNullException("connection");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If we receive parameter values, we need to figure out where they go
                if ((parameterValues != null) && (parameterValues.Length > 0))
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                        // Assign the provided values to these parameters based on parameter order
                        AssignParameterValues(commandParameters, parameterValues);

                        // Call the overload that takes an array of SqlParameters
                        return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        // Otherwise we can just call the SP without params
                        return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
                }
        }

        /// <summary>
        /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlTransaction. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");
        /// </remarks>
        /// <param name="transaction">A valid SqlTransaction</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText)
        {
                // Pass through the call providing null for the set of SqlParameters
                return ExecuteNonQuery(transaction, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns no resultset) against the specified SqlTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction">A valid SqlTransaction</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
                if (transaction == null) throw new ArgumentNullException("transaction");
                if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

                // Create a command and prepare it for execution
                SqlCommand cmd = new SqlCommand();
                bool mustCloseConnection = false;
                PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

                // Finally, execute the command
                int retval = cmd.ExecuteNonQuery();

                // Detach the SqlParameters from the command object, so they can be used again
                cmd.Parameters.Clear();
                return retval;
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified 
        /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);
        /// </remarks>
        /// <param name="transaction">A valid SqlTransaction</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
                if (transaction == null) throw new ArgumentNullException("transaction");
                if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If we receive parameter values, we need to figure out where they go
                if ((parameterValues != null) && (parameterValues.Length > 0))
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                        // Assign the provided values to these parameters based on parameter order
                        AssignParameterValues(commandParameters, parameterValues);

                        // Call the overload that takes an array of SqlParameters
                        return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        // Otherwise we can just call the SP without params
                        return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
                }
        }

        #endregion ExecuteNonQuery

        #region ExecuteDataset

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 
        /// the connection string. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
        {
                // Pass through the call providing null for the set of SqlParameters
                return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
                if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

                // Create & open a SqlConnection, and dispose of it after we are done
                using (SqlConnection connection = new SqlConnection(connectionString))
                {
                        connection.Open();

                        // Call the overload that takes a connection in place of the connection string
                        return ExecuteDataset(connection, commandType, commandText, commandParameters);
                }
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 
        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)
        {
                if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If we receive parameter values, we need to figure out where they go
                if ((parameterValues != null) && (parameterValues.Length > 0))
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                        // Assign the provided values to these parameters based on parameter order
                        AssignParameterValues(commandParameters, parameterValues);

                        // Call the overload that takes an array of SqlParameters
                        return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        // Otherwise we can just call the SP without params
                        return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
                }
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="connection">A valid SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)
        {
                // Pass through the call providing null for the set of SqlParameters
                return ExecuteDataset(connection, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection">A valid SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
                if (connection == null) throw new ArgumentNullException("connection");

                // Create a command and prepare it for execution
                SqlCommand cmd = new SqlCommand();
                bool mustCloseConnection = false;
                PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);

                // Create the DataAdapter & DataSet
                using (SqlDataAdapter da = new SqlDataAdapter(cmd))
                {
                        DataSet ds = new DataSet();

                        // Fill the DataSet using default values for DataTable names, etc
                        da.Fill(ds);

                        // Detach the SqlParameters from the command object, so they can be used again
                        cmd.Parameters.Clear();

                        if (mustCloseConnection)
                                connection.Close();

                        // Return the dataset
                        return ds;
                }
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
        /// using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="connection">A valid SqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(SqlConnection connection, string spName, params object[] parameterValues)
        {
                if (connection == null) throw new ArgumentNullException("connection");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If we receive parameter values, we need to figure out where they go
                if ((parameterValues != null) && (parameterValues.Length > 0))
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                        // Assign the provided values to these parameters based on parameter order
                        AssignParameterValues(commandParameters, parameterValues);

                        // Call the overload that takes an array of SqlParameters
                        return ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        // Otherwise we can just call the SP without params
                        return ExecuteDataset(connection, CommandType.StoredProcedure, spName);
                }
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="transaction">A valid SqlTransaction</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText)
        {
                // Pass through the call providing null for the set of SqlParameters
                return ExecuteDataset(transaction, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction">A valid SqlTransaction</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
                if (transaction == null) throw new ArgumentNullException("transaction");
                if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

                // Create a command and prepare it for execution
                SqlCommand cmd = new SqlCommand();
                bool mustCloseConnection = false;
                PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

                // Create the DataAdapter & DataSet
                using (SqlDataAdapter da = new SqlDataAdapter(cmd))
                {
                        DataSet ds = new DataSet();

                        // Fill the DataSet using default values for DataTable names, etc
                        da.Fill(ds);

                        // Detach the SqlParameters from the command object, so they can be used again
                        cmd.Parameters.Clear();

                        // Return the dataset
                        return ds;
                }
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified 
        /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="transaction">A valid SqlTransaction</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
                if (transaction == null) throw new ArgumentNullException("transaction");
                if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If we receive parameter values, we need to figure out where they go
                if ((parameterValues != null) && (parameterValues.Length > 0))
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                        // Assign the provided values to these parameters based on parameter order
                        AssignParameterValues(commandParameters, parameterValues);

                        // Call the overload that takes an array of SqlParameters
                        return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        // Otherwise we can just call the SP without params
                        return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
                }
        }

        #endregion ExecuteDataset

        #region ExecuteReader

        /// <summary>
        /// This enum is used to indicate whether the connection was provided by the caller, or created by SqlHelper, so that
        /// we can set the appropriate CommandBehavior when calling ExecuteReader()
        /// </summary>
        private enum SqlConnectionOwnership
        {
                /// <summary>Connection is owned and managed by SqlHelper</summary>
                Internal,
                /// <summary>Connection is owned and managed by the caller</summary>
                External
        }

        /// <summary>
        /// Create and prepare a SqlCommand, and call ExecuteReader with the appropriate CommandBehavior.
        /// </summary>
        /// <remarks>
        /// If we created and opened the connection, we want the connection to be closed when the DataReader is closed.
        /// 
        /// If the caller provided the connection, we want to leave it to them to manage.
        /// </remarks>
        /// <param name="connection">A valid SqlConnection, on which to execute this command</param>
        /// <param name="transaction">A valid SqlTransaction, or 'null'</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">An array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>
        /// <param name="connectionOwnership">Indicates whether the connection parameter was provided by the caller, or created by SqlHelper</param>
        /// <returns>SqlDataReader containing the results of the command</returns>
        private static SqlDataReader ExecuteReader(SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, SqlConnectionOwnership connectionOwnership)
        {
                if (connection == null) throw new ArgumentNullException("connection");

                bool mustCloseConnection = false;
                // Create a command and prepare it for execution
                SqlCommand cmd = new SqlCommand();
                try
                {
                        PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

                        // Create a reader
                        SqlDataReader dataReader;

                        // Call ExecuteReader with the appropriate CommandBehavior
                        if (connectionOwnership == SqlConnectionOwnership.External)
                        {
                                dataReader = cmd.ExecuteReader();
                        }
                        else
                        {
                                dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                        }

                        // Detach the SqlParameters from the command object, so they can be used again.
                        // HACK: There is a problem here, the output parameter values are fletched 
                        // when the reader is closed, so if the parameters are detached from the command
                        // then the SqlReader can磘 set its values. 
                        // When this happen, the parameters can磘 be used again in other command.
                        bool canClear = true;
                        foreach (SqlParameter commandParameter in cmd.Parameters)
                        {
                                if (commandParameter.Direction != ParameterDirection.Input)
                                        canClear = false;
                        }

                        if (canClear)
                        {
                                cmd.Parameters.Clear();
                        }

                        return dataReader;
                }
                catch
                {
                        if (mustCloseConnection)
                                connection.Close();
                        throw;
                }
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 
        /// the connection string. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
        public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)
        {
                // Pass through the call providing null for the set of SqlParameters
                return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
        public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
                if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
                SqlConnection connection = null;
                try
                {
                        connection = new SqlConnection(connectionString);
                        connection.Open();

                        // Call the private overload that takes an internally owned connection in place of the connection string
                        return ExecuteReader(connection, null, commandType, commandText, commandParameters, SqlConnectionOwnership.Internal);
                }
                catch
                {
                        // If we fail to return the SqlDatReader, we need to close the connection ourselves
                        if (connection != null) connection.Close();
                        throw;
                }

        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 
        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  SqlDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
        public static SqlDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)
        {
                if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If we receive parameter values, we need to figure out where they go
                if ((parameterValues != null) && (parameterValues.Length > 0))
                {
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                        AssignParameterValues(commandParameters, parameterValues);

                        return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        // Otherwise we can just call the SP without params
                        return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
                }
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="connection">A valid SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
        public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText)
        {
                // Pass through the call providing null for the set of SqlParameters
                return ExecuteReader(connection, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection">A valid SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
        public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
                // Pass through the call to the private overload using a null transaction value and an externally owned connection
                return ExecuteReader(connection, (SqlTransaction)null, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
        /// using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  SqlDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="connection">A valid SqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
        public static SqlDataReader ExecuteReader(SqlConnection connection, string spName, params object[] parameterValues)
        {
                if (connection == null) throw new ArgumentNullException("connection");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If we receive parameter values, we need to figure out where they go
                if ((parameterValues != null) && (parameterValues.Length > 0))
                {
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                        AssignParameterValues(commandParameters, parameterValues);

                        return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        // Otherwise we can just call the SP without params
                        return ExecuteReader(connection, CommandType.StoredProcedure, spName);
                }
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="transaction">A valid SqlTransaction</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
        public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText)
        {
                // Pass through the call providing null for the set of SqlParameters
                return ExecuteReader(transaction, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///   SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction">A valid SqlTransaction</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
        public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
                if (transaction == null) throw new ArgumentNullException("transaction");
                if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

                // Pass through to private overload, indicating that the connection is owned by the caller
                return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified
        /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  SqlDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="transaction">A valid SqlTransaction</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
        public static SqlDataReader ExecuteReader(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
                if (transaction == null) throw new ArgumentNullException("transaction");
                if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If we receive parameter values, we need to figure out where they go
                if ((parameterValues != null) && (parameterValues.Length > 0))
                {
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                        AssignParameterValues(commandParameters, parameterValues);

                        return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        // Otherwise we can just call the SP without params
                        return ExecuteReader(transaction, CommandType.StoredProcedure, spName);
                }
        }

        #endregion ExecuteReader

        #region ExecuteScalar

        /// <summary>
        /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the database specified in 
        /// the connection string. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)
        {
                // Pass through the call providing null for the set of SqlParameters
                return ExecuteScalar(connectionString, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a 1x1 resultset) against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
                if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
                // Create & open a SqlConnection, and dispose of it after we are done
                using (SqlConnection connection = new SqlConnection(connectionString))
                {
                        connection.Open();

                        // Call the overload that takes a connection in place of the connection string
                        return ExecuteScalar(connection, commandType, commandText, commandParameters);
                }
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the database specified in 
        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36);
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)
        {
                if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If we receive parameter values, we need to figure out where they go
                if ((parameterValues != null) && (parameterValues.Length > 0))
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                        // Assign the provided values to these parameters based on parameter order
                        AssignParameterValues(commandParameters, parameterValues);

                        // Call the overload that takes an array of SqlParameters
                        return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        // Otherwise we can just call the SP without params
                        return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
                }
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlConnection. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");
        /// </remarks>
        /// <param name="connection">A valid SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText)
        {
                // Pass through the call providing null for the set of SqlParameters
                return ExecuteScalar(connection, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection">A valid SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
                if (connection == null) throw new ArgumentNullException("connection");

                // Create a command and prepare it for execution
                SqlCommand cmd = new SqlCommand();

                bool mustCloseConnection = false;
                PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);

                // Execute the command & return the results
                object retval = cmd.ExecuteScalar();

                // Detach the SqlParameters from the command object, so they can be used again
                cmd.Parameters.Clear();

                if (mustCloseConnection)
                        connection.Close();

                return retval;
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection 
        /// using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(conn, "GetOrderCount", 24, 36);
        /// </remarks>
        /// <param name="connection">A valid SqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(SqlConnection connection, string spName, params object[] parameterValues)
        {
                if (connection == null) throw new ArgumentNullException("connection");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If we receive parameter values, we need to figure out where they go
                if ((parameterValues != null) && (parameterValues.Length > 0))
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                        // Assign the provided values to these parameters based on parameter order
                        AssignParameterValues(commandParameters, parameterValues);

                        // Call the overload that takes an array of SqlParameters
                        return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        // Otherwise we can just call the SP without params
                        return ExecuteScalar(connection, CommandType.StoredProcedure, spName);
                }
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlTransaction. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");
        /// </remarks>
        /// <param name="transaction">A valid SqlTransaction</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText)
        {
                // Pass through the call providing null for the set of SqlParameters
                return ExecuteScalar(transaction, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction">A valid SqlTransaction</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
                if (transaction == null) throw new ArgumentNullException("transaction");
                if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

                // Create a command and prepare it for execution
                SqlCommand cmd = new SqlCommand();
                bool mustCloseConnection = false;
                PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

                // Execute the command & return the results
                object retval = cmd.ExecuteScalar();

                // Detach the SqlParameters from the command object, so they can be used again
                cmd.Parameters.Clear();
                return retval;
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified
        /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(trans, "GetOrderCount", 24, 36);
        /// </remarks>
        /// <param name="transaction">A valid SqlTransaction</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
                if (transaction == null) throw new ArgumentNullException("transaction");
                if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If we receive parameter values, we need to figure out where they go
                if ((parameterValues != null) && (parameterValues.Length > 0))
                {
                        // PPull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                        // Assign the provided values to these parameters based on parameter order
                        AssignParameterValues(commandParameters, parameterValues);

                        // Call the overload that takes an array of SqlParameters
                        return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        // Otherwise we can just call the SP without params
                        return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
                }
        }

        #endregion ExecuteScalar

        #region ExecuteXmlReader
        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="connection">A valid SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
        /// <returns>An XmlReader containing the resultset generated by the command</returns>
        public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText)
        {
                // Pass through the call providing null for the set of SqlParameters
                return ExecuteXmlReader(connection, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection">A valid SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
        /// <returns>An XmlReader containing the resultset generated by the command</returns>
        public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
                if (connection == null) throw new ArgumentNullException("connection");

                bool mustCloseConnection = false;
                // Create a command and prepare it for execution
                SqlCommand cmd = new SqlCommand();
                try
                {
                        PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);

                        // Create the DataAdapter & DataSet
                        XmlReader retval = cmd.ExecuteXmlReader();

                        // Detach the SqlParameters from the command object, so they can be used again
                        cmd.Parameters.Clear();

                        return retval;
                }
                catch
                {
                        if (mustCloseConnection)
                                connection.Close();
                        throw;
                }
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
        /// using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  XmlReader r = ExecuteXmlReader(conn, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="connection">A valid SqlConnection</param>
        /// <param name="spName">The name of the stored procedure using "FOR XML AUTO"</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>An XmlReader containing the resultset generated by the command</returns>
        public static XmlReader ExecuteXmlReader(SqlConnection connection, string spName, params object[] parameterValues)
        {
                if (connection == null) throw new ArgumentNullException("connection");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If we receive parameter values, we need to figure out where they go
                if ((parameterValues != null) && (parameterValues.Length > 0))
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                        // Assign the provided values to these parameters based on parameter order
                        AssignParameterValues(commandParameters, parameterValues);

                        // Call the overload that takes an array of SqlParameters
                        return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        // Otherwise we can just call the SP without params
                        return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
                }
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="transaction">A valid SqlTransaction</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
        /// <returns>An XmlReader containing the resultset generated by the command</returns>
        public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText)
        {
                // Pass through the call providing null for the set of SqlParameters
                return ExecuteXmlReader(transaction, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction">A valid SqlTransaction</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
        /// <returns>An XmlReader containing the resultset generated by the command</returns>
        public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
                if (transaction == null) throw new ArgumentNullException("transaction");
                if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

                // Create a command and prepare it for execution
                SqlCommand cmd = new SqlCommand();
                bool mustCloseConnection = false;
                PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

                // Create the DataAdapter & DataSet
                XmlReader retval = cmd.ExecuteXmlReader();

                // Detach the SqlParameters from the command object, so they can be used again
                cmd.Parameters.Clear();
                return retval;
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified 
        /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  XmlReader r = ExecuteXmlReader(trans, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="transaction">A valid SqlTransaction</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static XmlReader ExecuteXmlReader(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
                if (transaction == null) throw new ArgumentNullException("transaction");
                if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If we receive parameter values, we need to figure out where they go
                if ((parameterValues != null) && (parameterValues.Length > 0))
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                        // Assign the provided values to these parameters based on parameter order
                        AssignParameterValues(commandParameters, parameterValues);

                        // Call the overload that takes an array of SqlParameters
                        return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        // Otherwise we can just call the SP without params
                        return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
                }
        }

        #endregion ExecuteXmlReader

        #region FillDataset
        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 
        /// the connection string. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)</param>
        public static void FillDataset(string connectionString, CommandType commandType, string commandText, DataSet dataSet, string[] tableNames)
        {
                if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
                if (dataSet == null) throw new ArgumentNullException("dataSet");

                // Create & open a SqlConnection, and dispose of it after we are done
                using (SqlConnection connection = new SqlConnection(connectionString))
                {
                        connection.Open();

                        // Call the overload that takes a connection in place of the connection string
                        FillDataset(connection, commandType, commandText, dataSet, tableNames);
                }
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// </param>
        public static void FillDataset(string connectionString, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames,
            params SqlParameter[] commandParameters)
        {
                if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
                if (dataSet == null) throw new ArgumentNullException("dataSet");
                // Create & open a SqlConnection, and dispose of it after we are done
                using (SqlConnection connection = new SqlConnection(connectionString))
                {
                        connection.Open();

                        // Call the overload that takes a connection in place of the connection string
                        FillDataset(connection, commandType, commandText, dataSet, tableNames, commandParameters);
                }
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 
        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, 24);
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// </param>    
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        public static void FillDataset(string connectionString, string spName,
            DataSet dataSet, string[] tableNames,
            params object[] parameterValues)
        {
                if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
                if (dataSet == null) throw new ArgumentNullException("dataSet");
                // Create & open a SqlConnection, and dispose of it after we are done
                using (SqlConnection connection = new SqlConnection(connectionString))
                {
                        connection.Open();

                        // Call the overload that takes a connection in place of the connection string
                        FillDataset(connection, spName, dataSet, tableNames, parameterValues);
                }
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
        /// </remarks>
        /// <param name="connection">A valid SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// </param>    
        public static void FillDataset(SqlConnection connection, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames)
        {
                FillDataset(connection, commandType, commandText, dataSet, tableNames, null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection">A valid SqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// </param>
        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
        public static void FillDataset(SqlConnection connection, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames,
            params SqlParameter[] commandParameters)
        {
                FillDataset(connection, null, commandType, commandText, dataSet, tableNames, commandParameters);
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
        /// using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  FillDataset(conn, "GetOrders", ds, new string[] {"orders"}, 24, 36);
        /// </remarks>
        /// <param name="connection">A valid SqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// </param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        public static void FillDataset(SqlConnection connection, string spName,
            DataSet dataSet, string[] tableNames,
            params object[] parameterValues)
        {
                if (connection == null) throw new ArgumentNullException("connection");
                if (dataSet == null) throw new ArgumentNullException("dataSet");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If we receive parameter values, we need to figure out where they go
                if ((parameterValues != null) && (parameterValues.Length > 0))
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                        // Assign the provided values to these parameters based on parameter order
                        AssignParameterValues(commandParameters, parameterValues);

                        // Call the overload that takes an array of SqlParameters
                        FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
                }
                else
                {
                        // Otherwise we can just call the SP without params
                        FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames);
                }
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
        /// </remarks>
        /// <param name="transaction">A valid SqlTransaction</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// </param>
        public static void FillDataset(SqlTransaction transaction, CommandType commandType,
            string commandText,
            DataSet dataSet, string[] tableNames)
        {
                FillDataset(transaction, commandType, commandText, dataSet, tableNames, null);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction">A valid SqlTransaction</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// </param>
        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
        public static void FillDataset(SqlTransaction transaction, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames,
            params SqlParameter[] commandParameters)
        {
                FillDataset(transaction.Connection, transaction, commandType, commandText, dataSet, tableNames, commandParameters);
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified 
        /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  FillDataset(trans, "GetOrders", ds, new string[]{"orders"}, 24, 36);
        /// </remarks>
        /// <param name="transaction">A valid SqlTransaction</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// </param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        public static void FillDataset(SqlTransaction transaction, string spName,
            DataSet dataSet, string[] tableNames,
            params object[] parameterValues)
        {
                if (transaction == null) throw new ArgumentNullException("transaction");
                if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
                if (dataSet == null) throw new ArgumentNullException("dataSet");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If we receive parameter values, we need to figure out where they go
                if ((parameterValues != null) && (parameterValues.Length > 0))
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                        // Assign the provided values to these parameters based on parameter order
                        AssignParameterValues(commandParameters, parameterValues);

                        // Call the overload that takes an array of SqlParameters
                        FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
                }
                else
                {
                        // Otherwise we can just call the SP without params
                        FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames);
                }
        }

        /// <summary>
        /// Private helper method that execute a SqlCommand (that returns a resultset) against the specified SqlTransaction and SqlConnection
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  FillDataset(conn, trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection">A valid SqlConnection</param>
        /// <param name="transaction">A valid SqlTransaction</param>
        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// </param>
        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
        private static void FillDataset(SqlConnection connection, SqlTransaction transaction, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames,
            params SqlParameter[] commandParameters)
        {
                if (connection == null) throw new ArgumentNullException("connection");
                if (dataSet == null) throw new ArgumentNullException("dataSet");

                // Create a command and prepare it for execution
                SqlCommand command = new SqlCommand();
                bool mustCloseConnection = false;
                PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

                // Create the DataAdapter & DataSet
                using (SqlDataAdapter dataAdapter = new SqlDataAdapter(command))
                {

                        // Add the table mappings specified by the user
                        if (tableNames != null && tableNames.Length > 0)
                        {
                                string tableName = "Table";
                                for (int index = 0; index < tableNames.Length; index++)
                                {
                                        if (tableNames[index] == null || tableNames[index].Length == 0) throw new ArgumentException("The tableNames parameter must contain a list of tables, a value was provided as null or empty string.", "tableNames");
                                        dataAdapter.TableMappings.Add(tableName, tableNames[index]);
                                        tableName += (index + 1).ToString();
                                }
                        }

                        // Fill the DataSet using default values for DataTable names, etc
                        dataAdapter.Fill(dataSet);

                        // Detach the SqlParameters from the command object, so they can be used again
                        command.Parameters.Clear();
                }

                if (mustCloseConnection)
                        connection.Close();
        }
        #endregion

        #region UpdateDataset
        /// <summary>
        /// Executes the respective command for each inserted, updated, or deleted row in the DataSet.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  UpdateDataset(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order");
        /// </remarks>
        /// <param name="insertCommand">A valid transact-SQL statement or stored procedure to insert new records into the data source</param>
        /// <param name="deleteCommand">A valid transact-SQL statement or stored procedure to delete records from the data source</param>
        /// <param name="updateCommand">A valid transact-SQL statement or stored procedure used to update records in the data source</param>
        /// <param name="dataSet">The DataSet used to update the data source</param>
        /// <param name="tableName">The DataTable used to update the data source.</param>
        public static void UpdateDataset(SqlCommand insertCommand, SqlCommand deleteCommand, SqlCommand updateCommand, DataSet dataSet, string tableName)
        {
                if (insertCommand == null) throw new ArgumentNullException("insertCommand");
                if (deleteCommand == null) throw new ArgumentNullException("deleteCommand");
                if (updateCommand == null) throw new ArgumentNullException("updateCommand");
                if (tableName == null || tableName.Length == 0) throw new ArgumentNullException("tableName");

                // Create a SqlDataAdapter, and dispose of it after we are done
                using (SqlDataAdapter dataAdapter = new SqlDataAdapter())
                {
                        // Set the data adapter commands
                        dataAdapter.UpdateCommand = updateCommand;
                        dataAdapter.InsertCommand = insertCommand;
                        dataAdapter.DeleteCommand = deleteCommand;

                        // Update the dataset changes in the data source
                        dataAdapter.Update(dataSet, tableName);

                        // Commit all the changes made to the DataSet
                        dataSet.AcceptChanges();
                }
        }
        #endregion

        #region CreateCommand
        /// <summary>
        /// Simplify the creation of a Sql command object by allowing
        /// a stored procedure and optional parameters to be provided
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  SqlCommand command = CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");
        /// </remarks>
        /// <param name="connection">A valid SqlConnection object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="sourceColumns">An array of string to be assigned as the source columns of the stored procedure parameters</param>
        /// <returns>A valid SqlCommand object</returns>
        public static SqlCommand CreateCommand(SqlConnection connection, string spName, params string[] sourceColumns)
        {
                if (connection == null) throw new ArgumentNullException("connection");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // Create a SqlCommand
                SqlCommand cmd = new SqlCommand(spName, connection);
                cmd.CommandType = CommandType.StoredProcedure;

                // If we receive parameter values, we need to figure out where they go
                if ((sourceColumns != null) && (sourceColumns.Length > 0))
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                        // Assign the provided source columns to these parameters based on parameter order
                        for (int index = 0; index < sourceColumns.Length; index++)
                                commandParameters[index].SourceColumn = sourceColumns[index];

                        // Attach the discovered parameters to the SqlCommand object
                        AttachParameters(cmd, commandParameters);
                }

                return cmd;
        }
        #endregion

        #region ExecuteNonQueryTypedParams
        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in 
        /// the connection string using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
        /// </summary>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQueryTypedParams(String connectionString, String spName, DataRow dataRow)
        {
                if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If the row has values, the store procedure parameters must be initialized
                if (dataRow != null && dataRow.ItemArray.Length > 0)
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                        // Set the parameters values
                        AssignParameterValues(commandParameters, dataRow);

                        return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
                }
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified SqlConnection 
        /// using the dataRow column values as the stored procedure's parameters values.  
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
        /// </summary>
        /// <param name="connection">A valid SqlConnection object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQueryTypedParams(SqlConnection connection, String spName, DataRow dataRow)
        {
                if (connection == null) throw new ArgumentNullException("connection");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If the row has values, the store procedure parameters must be initialized
                if (dataRow != null && dataRow.ItemArray.Length > 0)
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                        // Set the parameters values
                        AssignParameterValues(commandParameters, dataRow);

                        return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
                }
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified
        /// SqlTransaction using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
        /// </summary>
        /// <param name="transaction">A valid SqlTransaction object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQueryTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
        {
                if (transaction == null) throw new ArgumentNullException("transaction");
                if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // Sf the row has values, the store procedure parameters must be initialized
                if (dataRow != null && dataRow.ItemArray.Length > 0)
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                        // Set the parameters values
                        AssignParameterValues(commandParameters, dataRow);

                        return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
                }
        }
        #endregion

        #region ExecuteDatasetTypedParams
        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 
        /// the connection string using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
        /// </summary>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDatasetTypedParams(string connectionString, String spName, DataRow dataRow)
        {
                if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                //If the row has values, the store procedure parameters must be initialized
                if (dataRow != null && dataRow.ItemArray.Length > 0)
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                        // Set the parameters values
                        AssignParameterValues(commandParameters, dataRow);

                        return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
                }
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
        /// using the dataRow column values as the store procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
        /// </summary>
        /// <param name="connection">A valid SqlConnection object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDatasetTypedParams(SqlConnection connection, String spName, DataRow dataRow)
        {
                if (connection == null) throw new ArgumentNullException("connection");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If the row has values, the store procedure parameters must be initialized
                if (dataRow != null && dataRow.ItemArray.Length > 0)
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                        // Set the parameters values
                        AssignParameterValues(commandParameters, dataRow);

                        return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName);
                }
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction 
        /// using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
        /// </summary>
        /// <param name="transaction">A valid SqlTransaction object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDatasetTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
        {
                if (transaction == null) throw new ArgumentNullException("transaction");
                if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If the row has values, the store procedure parameters must be initialized
                if (dataRow != null && dataRow.ItemArray.Length > 0)
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                        // Set the parameters values
                        AssignParameterValues(commandParameters, dataRow);

                        return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
                }
        }

        #endregion

        #region ExecuteReaderTypedParams
        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 
        /// the connection string using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
        public static SqlDataReader ExecuteReaderTypedParams(String connectionString, String spName, DataRow dataRow)
        {
                if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If the row has values, the store procedure parameters must be initialized
                if (dataRow != null && dataRow.ItemArray.Length > 0)
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                        // Set the parameters values
                        AssignParameterValues(commandParameters, dataRow);

                        return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
                }
        }


        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
        /// using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <param name="connection">A valid SqlConnection object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
        public static SqlDataReader ExecuteReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
        {
                if (connection == null) throw new ArgumentNullException("connection");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If the row has values, the store procedure parameters must be initialized
                if (dataRow != null && dataRow.ItemArray.Length > 0)
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                        // Set the parameters values
                        AssignParameterValues(commandParameters, dataRow);

                        return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName);
                }
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction 
        /// using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <param name="transaction">A valid SqlTransaction object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
        public static SqlDataReader ExecuteReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
        {
                if (transaction == null) throw new ArgumentNullException("transaction");
                if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If the row has values, the store procedure parameters must be initialized
                if (dataRow != null && dataRow.ItemArray.Length > 0)
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                        // Set the parameters values
                        AssignParameterValues(commandParameters, dataRow);

                        return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName);
                }
        }
        #endregion

        #region ExecuteScalarTypedParams
        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the database specified in 
        /// the connection string using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalarTypedParams(String connectionString, String spName, DataRow dataRow)
        {
                if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If the row has values, the store procedure parameters must be initialized
                if (dataRow != null && dataRow.ItemArray.Length > 0)
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                        // Set the parameters values
                        AssignParameterValues(commandParameters, dataRow);

                        return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
                }
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection 
        /// using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <param name="connection">A valid SqlConnection object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalarTypedParams(SqlConnection connection, String spName, DataRow dataRow)
        {
                if (connection == null) throw new ArgumentNullException("connection");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If the row has values, the store procedure parameters must be initialized
                if (dataRow != null && dataRow.ItemArray.Length > 0)
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                        // Set the parameters values
                        AssignParameterValues(commandParameters, dataRow);

                        return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName);
                }
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction
        /// using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <param name="transaction">A valid SqlTransaction object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalarTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
        {
                if (transaction == null) throw new ArgumentNullException("transaction");
                if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If the row has values, the store procedure parameters must be initialized
                if (dataRow != null && dataRow.ItemArray.Length > 0)
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                        // Set the parameters values
                        AssignParameterValues(commandParameters, dataRow);

                        return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
                }
        }
        #endregion

        #region ExecuteXmlReaderTypedParams
        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
        /// using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <param name="connection">A valid SqlConnection object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
        /// <returns>An XmlReader containing the resultset generated by the command</returns>
        public static XmlReader ExecuteXmlReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
        {
                if (connection == null) throw new ArgumentNullException("connection");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If the row has values, the store procedure parameters must be initialized
                if (dataRow != null && dataRow.ItemArray.Length > 0)
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                        // Set the parameters values
                        AssignParameterValues(commandParameters, dataRow);

                        return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
                }
        }

        /// <summary>
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction 
        /// using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <param name="transaction">A valid SqlTransaction object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
        /// <returns>An XmlReader containing the resultset generated by the command</returns>
        public static XmlReader ExecuteXmlReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
        {
                if (transaction == null) throw new ArgumentNullException("transaction");
                if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                // If the row has values, the store procedure parameters must be initialized
                if (dataRow != null && dataRow.ItemArray.Length > 0)
                {
                        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                        // Set the parameters values
                        AssignParameterValues(commandParameters, dataRow);

                        return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
                }
                else
                {
                        return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
                }
        }
        #endregion

}

/// <summary>
/// SqlHelperParameterCache provides functions to leverage a static cache of procedure parameters, and the
/// ability to discover parameters for stored procedures at run-time.
/// </summary>
public sealed class SqlHelperParameterCache
{
        #region private methods, variables, and constructors

        //Since this class provides only static methods, make the default constructor private to prevent 
        //instances from being created with "new SqlHelperParameterCache()"
        private SqlHelperParameterCache() { }

        private static Hashtable paramCache = Hashtable.Synchronized(new Hashtable());

        /// <summary>
        /// Resolve at run time the appropriate set of SqlParameters for a stored procedure
        /// </summary>
        /// <param name="connection">A valid SqlConnection object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="includeReturnValueParameter">Whether or not to include their return value parameter</param>
        /// <returns>The parameter array discovered.</returns>
        private static SqlParameter[] DiscoverSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)
        {
                if (connection == null) throw new ArgumentNullException("connection");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                SqlCommand cmd = new SqlCommand(spName, connection);
                cmd.CommandType = CommandType.StoredProcedure;

                connection.Open();
                SqlCommandBuilder.DeriveParameters(cmd);
                connection.Close();

                if (!includeReturnValueParameter)
                {
                        cmd.Parameters.RemoveAt(0);
                }

                SqlParameter[] discoveredParameters = new SqlParameter[cmd.Parameters.Count];

                cmd.Parameters.CopyTo(discoveredParameters, 0);

                // Init the parameters with a DBNull value
                foreach (SqlParameter discoveredParameter in discoveredParameters)
                {
                        discoveredParameter.Value = DBNull.Value;
                }
                return discoveredParameters;
        }

        /// <summary>
        /// Deep copy of cached SqlParameter array
        /// </summary>
        /// <param name="originalParameters"></param>
        /// <returns></returns>
        private static SqlParameter[] CloneParameters(SqlParameter[] originalParameters)
        {
                SqlParameter[] clonedParameters = new SqlParameter[originalParameters.Length];

                for (int i = 0, j = originalParameters.Length; i < j; i++)
                {
                        clonedParameters[i] = (SqlParameter)((ICloneable)originalParameters[i]).Clone();
                }

                return clonedParameters;
        }

        #endregion private methods, variables, and constructors

        #region caching functions

        /// <summary>
        /// Add parameter array to the cache
        /// </summary>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">An array of SqlParamters to be cached</param>
        public static void CacheParameterSet(string connectionString, string commandText, params SqlParameter[] commandParameters)
        {
                if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
                if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");

                string hashKey = connectionString + ":" + commandText;

                paramCache[hashKey] = commandParameters;
        }

        /// <summary>
        /// Retrieve a parameter array from the cache
        /// </summary>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="commandText">The stored procedure name or T-SQL command</param>
        /// <returns>An array of SqlParamters</returns>
        public static SqlParameter[] GetCachedParameterSet(string connectionString, string commandText)
        {
                if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
                if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");

                string hashKey = connectionString + ":" + commandText;

                SqlParameter[] cachedParameters = paramCache[hashKey] as SqlParameter[];
                if (cachedParameters == null)
                {
                        return null;
                }
                else
                {
                        return CloneParameters(cachedParameters);
                }
        }

        #endregion caching functions

        #region Parameter Discovery Functions

        /// <summary>
        /// Retrieves the set of SqlParameters appropriate for the stored procedure
        /// </summary>
        /// <remarks>
        /// This method will query the database for this information, and then store it in a cache for future requests.
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <returns>An array of SqlParameters</returns>
        public static SqlParameter[] GetSpParameterSet(string connectionString, string spName)
        {
                return GetSpParameterSet(connectionString, spName, false);
        }

        /// <summary>
        /// Retrieves the set of SqlParameters appropriate for the stored procedure
        /// </summary>
        /// <remarks>
        /// This method will query the database for this information, and then store it in a cache for future requests.
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a SqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
        /// <returns>An array of SqlParameters</returns>
        public static SqlParameter[] GetSpParameterSet(string connectionString, string spName, bool includeReturnValueParameter)
        {
                if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                using (SqlConnection connection = new SqlConnection(connectionString))
                {
                        return GetSpParameterSetInternal(connection, spName, includeReturnValueParameter);
                }
        }

        /// <summary>
        /// Retrieves the set of SqlParameters appropriate for the stored procedure
        /// </summary>
        /// <remarks>
        /// This method will query the database for this information, and then store it in a cache for future requests.
        /// </remarks>
        /// <param name="connection">A valid SqlConnection object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <returns>An array of SqlParameters</returns>
        internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName)
        {
                return GetSpParameterSet(connection, spName, false);
        }

        /// <summary>
        /// Retrieves the set of SqlParameters appropriate for the stored procedure
        /// </summary>
        /// <remarks>
        /// This method will query the database for this information, and then store it in a cache for future requests.
        /// </remarks>
        /// <param name="connection">A valid SqlConnection object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
        /// <returns>An array of SqlParameters</returns>
        internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)
        {
                if (connection == null) throw new ArgumentNullException("connection");
                using (SqlConnection clonedConnection = (SqlConnection)((ICloneable)connection).Clone())
                {
                        return GetSpParameterSetInternal(clonedConnection, spName, includeReturnValueParameter);
                }
        }

        /// <summary>
        /// Retrieves the set of SqlParameters appropriate for the stored procedure
        /// </summary>
        /// <param name="connection">A valid SqlConnection object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
        /// <returns>An array of SqlParameters</returns>
        private static SqlParameter[] GetSpParameterSetInternal(SqlConnection connection, string spName, bool includeReturnValueParameter)
        {
                if (connection == null) throw new ArgumentNullException("connection");
                if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

                string hashKey = connection.ConnectionString + ":" + spName + (includeReturnValueParameter ? ":include ReturnValue Parameter" : "");

                SqlParameter[] cachedParameters;

                cachedParameters = paramCache[hashKey] as SqlParameter[];
                if (cachedParameters == null)
                {
                        SqlParameter[] spParameters = DiscoverSpParameterSet(connection, spName, includeReturnValueParameter);
                        paramCache[hashKey] = spParameters;
                        cachedParameters = spParameters;
                }

                return CloneParameters(cachedParameters);
        }

        #endregion Parameter Discovery Functions

}