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Refreshing the control content using Timer control

<%@ Page Language="C#" %> <%@ Import Namespace="System.Collections.Generic" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server">     protected void Page_Load(object sender, EventArgs e)     {         List<string> quotes = new List<string>();         quotes.Add("A");         quotes.Add("B");         quotes.Add("C");         Random rnd = new Random();         lblQuote.Text = quotes[rnd.Next(quotes.Count)];     } </script> <html xmlns="http://www.w3.org/1999/xhtml"> <head id="Head1" runat="server">     <title>Timer Quote</title> </head> <body>     <form id="form1" runat="server">     <div>     <asp:ScriptManager ID="ScriptManager1" runat="server" />     <asp:Timer ID="Timer1" Interval="2000" runat="server" />     Page Time: <%= DateTime.Now.ToString("T") %>     <fieldset>     <legend>Quote</legend>     <asp:UpdatePanel ID="up1" runat="server">     <Triggers>         <asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />     </Triggers>     <ContentTemplate>         <asp:Label ID="lblQuote" runat="server" />     </ContentTemplate>     </asp:UpdatePanel>     </fieldset>     </div>     </form> </body> </html>