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UpdatePanel control is defined dynamically but constructing the tree programmatically

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs"      Inherits="Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server">     <title>Building Regions Dynamically</title> </head> <body>     <form id="form1" runat="server">         <div runat="server" id="pageContent">             <asp:ScriptManager ID="ScriptManager1" runat="server" />         </div>     </form> </body> </html> File: Default.aspx.cs using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Drawing; using System.Web.UI; using System.Web.UI.WebControls; public partial class Default : System.Web.UI.Page {     private Label Label1;      protected void Page_Load(object sender, EventArgs e)     {         UpdatePanel up1 = new UpdatePanel();         up1.ID = "UpdatePanel1";                  Button button1 = new Button();         button1.ID = "Button1";         button1.Text = "What time is it?";         button1.Click += new EventHandler(Button1_Click);         LiteralControl lit = new LiteralControl("<br>");         Label1 = new Label();         Label1.ID = "Label1";         Label1.Text = "[time]";                  up1.ContentTemplateContainer.Controls.Add(button1);         up1.ContentTemplateContainer.Controls.Add(lit);          up1.ContentTemplateContainer.Controls.Add(Label1);         this.Form.FindControl("pageContent").Controls.Add(up1);     }     protected void Button1_Click(object sender, EventArgs e)     {         Label1.Text = DateTime.Now.ToLongTimeString();      } }