Watch TextBox, CheckBox and radiobutton auto post back action (C#) : TextBox « Asp Control « ASP.Net

Watch TextBox, CheckBox and radiobutton auto post back action (C#)

<%@ Page language="c#" src="EventTracker.aspx.cs" AutoEventWireup="false" Inherits="EventTracker" %>
    <form id="Form1" method="post" runat="server">
      <P><h3>Controls being monitored for change events:</h3>
        <asp:TextBox id="txt" runat="server" AutoPostBack="True">Text box auto post back</asp:TextBox><BR>
        <asp:CheckBox id="chk" runat="server" AutoPostBack="True"></asp:CheckBox><BR>
        <asp:RadioButton id="opt1" runat="server" GroupName="Sample" AutoPostBack="True"></asp:RadioButton>
        <asp:RadioButton id="opt2" runat="server" GroupName="Sample" AutoPostBack="True"></asp:RadioButton><BR>
        <h3>List of events:</h3>
        <asp:ListBox id="lstEvents" runat="server" Width="355px" Height="256px"></asp:ListBox><BR>

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

  public class EventTracker : System.Web.UI.Page
    protected System.Web.UI.WebControls.TextBox txt;
    protected System.Web.UI.WebControls.CheckBox chk;
    protected System.Web.UI.WebControls.RadioButton opt1;
    protected System.Web.UI.WebControls.RadioButton opt2;
    protected System.Web.UI.WebControls.ListBox lstEvents;
    private void Page_Load(object sender, System.EventArgs e)
       Log("<< Page_Load >>");

    #region Web Form Designer generated code
    override protected void OnInit(EventArgs e)
      // CODEGEN: This call is required by the ASP.NET Web Form Designer.
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
      this.txt.TextChanged += new System.EventHandler(this.CtrlChanged);
      this.chk.CheckedChanged += new System.EventHandler(this.CtrlChanged);
      this.opt1.CheckedChanged += new System.EventHandler(this.CtrlChanged);
      this.opt2.CheckedChanged += new System.EventHandler(this.CtrlChanged);
      this.Load += new System.EventHandler(this.Page_Load);
      this.PreRender += new System.EventHandler(this.EventTracker_PreRender);


    private void Log(string entry)

      // Select the last item to scroll the list so the most recent
      // entries are visible.
      lstEvents.SelectedIndex = lstEvents.Items.Count - 1;

    private void EventTracker_PreRender(object sender, System.EventArgs e)
      // When the Page.UnLoad event occurs it is too late
      // to change the list.


    private void CtrlChanged(Object sender, EventArgs e)
      // Find the control ID of the sender.
      // This requires converting the Object type into a Control class.
      string ctrlName = ((Control)sender).ID;
      Log(ctrlName + " Changed");



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