The-method-adds-an-output-parameter-to-the-SqlCommand-object


            File: GetTotals.sql
CREATE PROCEDURE dbo.GetTotals
(
  @SumTotals Money OUTPUT
)
AS
SELECT @SumTotals = SUM(Totals) FROM Products
File: App_Code\Product.cs
using System;
using System.Data;
using System.Data.SqlClient;
using System.Web.Configuration;
using System.Collections.Generic;
public class Product
{
    private static readonly string _connectionString;
    private string _title;
    private decimal _boxOfficeTotals;
    public string Title
    {
        get { return _title; }
        set { _title = value; }
    }
    public decimal Totals
    {
        get { return _boxOfficeTotals; }
        set { _boxOfficeTotals = value; }
    }
    public List GetPrice(out decimal SumTotals)
    {
        List results = new List();
        SqlConnection con = new SqlConnection(_connectionString);
        SqlCommand cmd = new SqlCommand("GetTotals", con);
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Parameters.Add("@SumTotals", SqlDbType.Money).Direction = ParameterDirection.Output;
        using (con)
        {
            con.Open();
            SqlDataReader reader = cmd.ExecuteReader();
            while (reader.Read())
            {
                Product newProduct = new Product();
                newProduct.Title = (string)reader["Title"];
                newProduct.Totals = (decimal)reader["Totals"];
                results.Add(newProduct);
            }
            reader.Close();
            SumTotals = (decimal)cmd.Parameters["@SumTotals"].Value;
       }
       return results;
    }    static Product()
    {
        _connectionString = WebConfigurationManager.ConnectionStrings["Products"].ConnectionString;
    }
}
File: Web.config

  
             connectionString="Data Source=.\SQLEXPRESS;
         AttachDbFilename=|DataDirectory|MyDatabase.mdf;Integrated Security=True;User Instance=True" />
  
            
File: ShowProduct.aspx
<%@ Page Language="C#" %>
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

    protected void srcProducts_Selected(object sender, ObjectDataSourceStatusEventArgs e)
    {
        decimal sum = (decimal)e.OutputParameters["SumTotals"];
        lblSum.Text = sum.ToString("c");
    }



    Show Product


    
    
            id="grdProducts"
        DataSourceID="srcProducts"
        AutoGenerateColumns="false"
        Runat="server">
        
        
                    DataField="Totals"
            HeaderText="Box Office"
            HtmlEncode="false"
            DataFormatString="{0:c}" />
        
    
    
    Sum of Box Office Totals:
            id="lblSum"
        Runat="server" />
            id="srcProducts"
        TypeName="Product"
        SelectMethod="GetPrice"
        Runat="server" OnSelected="srcProducts_Selected">
        
                    Name="SumTotals"
            Type="Decimal"
            Direction="Output" />
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