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ASP controls in user control

<%@ Page Language="C#" AutoEventWireup="true" %> <%@ Register Src="Control.ascx" TagName="VaryByControl" TagPrefix="uc1" %> <!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>         <uc1:VaryByControl ID="VaryByControl1" runat="server" />          </div>     </form> </body> </html> File: Control.ascx <%@ Control Language="C#"              AutoEventWireup="true"              CodeFile="Control.ascx.cs"              Inherits="VaryByControl" %> <%@ OutputCache Duration="30" VaryByControl="lstMode"  %> <asp:DropDownList id="lstMode" runat="server" Width="187px">   <asp:ListItem>Large</asp:ListItem>   <asp:ListItem>Small</asp:ListItem>   <asp:ListItem>Medium</asp:ListItem> </asp:DropDownList>&nbsp;<br /> Control generated at:<br />  <asp:label id="TimeMsg" runat="server" /> File: Control.ascx.cs using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; public partial class VaryByControl : System.Web.UI.UserControl {     protected void Page_Load(object sender, EventArgs e)     {     switch (lstMode.SelectedIndex)     {       case 0:         TimeMsg.Font.Size = FontUnit.Large;         break;       case 1:         TimeMsg.Font.Size = FontUnit.Small;         break;       case 2:         TimeMsg.Font.Size = FontUnit.Medium;         break;     }     TimeMsg.Text = DateTime.Now.ToString("F");     } }