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  4. UpdatePanel control is defined dynamically but constructing the tree programmatically
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" 
    Inherits="Default" %>



    Building Regions Dynamically


    
        
            
        

    


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("
");
        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(); 
    }
}