ADO Database ASP.Net

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<%@ Page Language="C#" %>
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">


    
            id="ddlProductCategory"
        DataSourceID="srcProductCategories"
        DataTextField="Name"
        DataValueField="Id"
        ToolTip="Product Category"
        Runat="server" />
             id="btnSelect"
        Text="Select"
        Runat="server" />
              id="grdProducts"
         DataSourceID="srcProducts"
         CssClass="Products"
         GridLines="None"
         Runat="server" />
              id="srcProductCategories"
         TypeName="ProductCategories"
         SelectMethod="GetCategories"
         Runat="server" />
              id="srcProducts"
         TypeName="ProductCategories"
         SelectMethod="GetProducts"
         Runat="server">
         
                      Name="CategoryId"
             ControlID="ddlProductCategory" />
         
     
     


            
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

  
             connectionString="Data Source=.\SQLEXPRESS;
         AttachDbFilename=|DataDirectory|MyDatabase.mdf;Integrated Security=True;User Instance=True" />