CSharp Filtering Data – ADO.Net Database

<%@ 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" >
<head id="Head1" runat="server">
    <title>Show Filtered Products</title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:DropDownList
        id="ddlProductCategory"
        DataSourceID="srcProductCategories"
        DataTextField="Name"
        DataValueField="Id"
        Runat="server" />
    <asp:Button
        id="btnSelect"
        Text="Select"
        Runat="server" />
    <asp:GridView
        id="grdProducts"
        DataSourceID="srcProducts"
        AutoGenerateColumns="false"
        Runat="server">
        <columns>
        <asp:BoundField
            DataField="Title"
            HeaderText="Product Title" />
        <asp:BoundField
            DataField="Director"
            HeaderText="Product Director" />
        </columns>
    </asp:GridView>    <asp:ObjectDataSource
        id="srcProductCategories"
        TypeName="FilterProducts"
        SelectMethod="GetProductCategories"
        EnableCaching="true"
        CacheDuration="Infinite"
        Runat="server" />    <asp:ObjectDataSource
        id="srcProducts"
        TypeName="FilterProducts"
        SelectMethod="GetProducts"
        EnableCaching="true"
        CacheDuration="Infinite"
        FilterExpression="CategoryID={0}"
        Runat="server">
        <filterParameters>
        <asp:ControlParameter
            Name="Category"
            ControlID="ddlProductCategory" />
        </filterParameters>
    </asp:ObjectDataSource>
    </form>
</body>
</html>            File: FilterProducts.csusing 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;
    }
}

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