Using Different Parameter Types
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<body>
<form id="form1" runat="server">
<asp:DropDownList
id="ddlProductCategory"
DataSourceID="srcProductCategories"
DataTextField="Name"
DataValueField="Id"
ToolTip="Product Category"
Runat="server" />
<asp:Button
id="btnSelect"
Text="Select"
Runat="server" />
<asp:GridView
id="grdProducts"
DataSourceID="srcProducts"
CssClass="Products"
GridLines="None"
Runat="server" />
<asp:ObjectDataSource
id="srcProductCategories"
TypeName="ProductCategories"
SelectMethod="GetCategories"
Runat="server" />
<asp:ObjectDataSource
id="srcProducts"
TypeName="ProductCategories"
SelectMethod="GetProducts"
Runat="server">
<SelectParameters>
<asp:ControlParameter
Name="CategoryId"
ControlID="ddlProductCategory" />
</SelectParameters>
</asp:ObjectDataSource>
</form>
</body>
</html>
File: ProductCategories.cs
using System;
using System.Data;
using System.Data.SqlClient;
using System.Web.Configuration;
public class ProductCategories
{
private readonly string _conString;
public SqlDataReader GetProducts(int categoryId)
{
SqlConnection con = new SqlConnection(_conString);
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandText = "SELECT Id,Title,Director,DateReleased "
+ " FROM Products WHERE CategoryId=@CategoryId";
cmd.Parameters.AddWithValue("@CategoryId", categoryId);
con.Open();
return cmd.ExecuteReader(CommandBehavior.CloseConnection);
}
public SqlDataReader GetCategories()
{
SqlConnection con = new SqlConnection(_conString);
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandText = "SELECT Id,Name FROM ProductCategories";
con.Open();
return cmd.ExecuteReader(CommandBehavior.CloseConnection);
}
public ProductCategories()
{
_conString = WebConfigurationManager.ConnectionStrings["Products"]. ConnectionString;
}
}
File: Web.config
<configuration>
<connectionStrings>
<add name="Products"
connectionString="Data Source=.\SQLEXPRESS;
AttachDbFilename=|DataDirectory|MyDatabase.mdf;Integrated Security=True;User Instance=True" />
</connectionStrings>
</configuration>
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