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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" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:SqlDataSource ID="sourceEmployeeCities"
runat="server"
ProviderName="System.Data.SqlClient"
ConnectionString="<%$ ConnectionStrings:Northwind %>"
SelectCommand="SELECT DISTINCT City FROM Employees"
EnableCaching="True"
CacheDuration="3600">
</asp:SqlDataSource>
<asp:DropDownList ID="lstCities"
runat="server"
DataSourceID="sourceEmployeeCities"
DataTextField="City"
Width="205px"
AutoPostBack="True">
</asp:DropDownList>
<asp:SqlDataSource ID="sourceEmployees"
runat="server"
ProviderName="System.Data.SqlClient"
ConnectionString="<%$ ConnectionStrings:Northwind %>"
SelectCommand="SELECT EmployeeID, FirstName, LastName, Title, City FROM Employees WHERE City=@City"
EnableCaching="True"
CacheDuration="600">
<SelectParameters>
<asp:ControlParameter ControlID="lstCities" Name="City" PropertyName="SelectedValue" />
</SelectParameters>
</asp:SqlDataSource>
<asp:GridView ID="GridView1"
runat="server"
DataSourceID="sourceEmployees"
AutoGenerateColumns="False"
DataKeyNames="EmployeeID">
<AlternatingRowStyle BackColor="White" />
<Columns>
<asp:BoundField DataField="EmployeeID" HeaderText="EmployeeID" InsertVisible="False"
ReadOnly="True" SortExpression="EmployeeID" />
<asp:BoundField DataField="FirstName" HeaderText="FirstName" SortExpression="FirstName" />
<asp:BoundField DataField="LastName" HeaderText="LastName" SortExpression="LastName" />
<asp:BoundField DataField="Title" HeaderText="Title" SortExpression="Title" />
<asp:BoundField DataField="City" HeaderText="City" SortExpression="City" />
</Columns>
</asp:GridView>
</div>
</form>
</body>
</html>
File: Web.config
<?xml version="1.0"?>
<configuration>
<connectionStrings>
<add name="Northwind" connectionString="Data Source=localhost\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=SSPI"/>
</connectionStrings>
</configuration>
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