ADO Database ASP.Net

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


    Show Filtered Products


    
            id="ddlProductCategory"
        DataSourceID="srcProductCategories"
        DataTextField="Name"
        DataValueField="Id"
        Runat="server" />
            id="btnSelect"
        Text="Select"
        Runat="server" />
            id="grdProducts"
        DataSourceID="srcProducts"
        AutoGenerateColumns="false"
        Runat="server">
        
                    DataField="Title"
            HeaderText="Product Title" />
                    DataField="Director"
            HeaderText="Product Director" />
        
    
            id="srcProductCategories"
        TypeName="FilterProducts"
        SelectMethod="GetProductCategories"
        EnableCaching="true"
        CacheDuration="Infinite"
        Runat="server" />
            id="srcProducts"
        TypeName="FilterProducts"
        SelectMethod="GetProducts"
        EnableCaching="true"
        CacheDuration="Infinite"
        FilterExpression="CategoryID={0}"
        Runat="server">
        
                    Name="Category"
            ControlID="ddlProductCategory" />
        
    
    


            
File: FilterProducts.cs
using System;
using System.Web;
using System.Data;
using System.Data.SqlClient;
using System.Web.Configuration;
public class FilterProducts
{
    private readonly string _conString;
    public DataSet GetProducts()
    {
        SqlConnection con = new SqlConnection(_conString);
        string commandText = "SELECT Title,Director,CategoryId FROM Products";
        SqlDataAdapter dad = new SqlDataAdapter(commandText, con);
        DataSet dstProducts = new DataSet();
        using (con)
        {
            dad.Fill(dstProducts);
        }
        return dstProducts;
    }
    public DataSet GetProductCategories()
    {
        SqlConnection con = new SqlConnection(_conString);
        string commandText = "SELECT Id,Name FROM ProductCategories";
        SqlDataAdapter dad = new SqlDataAdapter(commandText, con);
        DataSet dstCategories = new DataSet();
        using (con)
        {
            dad.Fill(dstCategories);
        }
        return dstCategories;
    }
    public FilterProducts()
    {
        _conString = WebConfigurationManager.ConnectionStrings["Products"]. ConnectionString;
    }
}