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<%@ 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">
<div>
<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"
CssClass="gridView"
Runat="server" />
<asp:SqlDataSource
id="srcProductCategories"
SelectCommand="SELECT Id, Name FROM ProductCategories"
ConnectionString="<%$ ConnectionStrings:Products %>"
Runat="server" />
<asp:SqlDataSource
id="srcProducts"
SelectCommand="SELECT Title,Director FROM Products
WHERE CategoryId=@Id"
ConnectionString="<%$ ConnectionStrings:Products %>"
Runat="server">
<SelectParameters>
<asp:ControlParameter
Name="Id"
ControlID="ddlProductCategory"
PropertyName="SelectedValue" />
</SelectParameters>
</asp:SqlDataSource>
</div>
</form>
</body>
</html>
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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