General learning example on .NET

on .aspx page:
===============

on .aspx.cs page:
==================

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Collections;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

ltl.Text = System.DateTime.Now.Second.ToString();
if (!IsPostBack)
{
//DropDownList1.Items.Add("AGirijesh");
//DropDownList1.Items.Add("BGirijesh");
//DropDownList1.Items.Add("CGirijesh");
//DropDownList1.Items.Add("DGirijesh");
//DropDownList1.Items.Add("EGirijesh");
ArrayList Items = new ArrayList();
Items.Add("GRIEI");
Items.Add("GRIEI");
Items.Add("GRIEI");
Items.Add("GRIEI");
Trace.Warn("Items");
DropDownList1.DataSource = Items;
DropDownList1.DataBind();

}
spannow.InnerText =DateTime.Now.ToString("T");
//SmtpClient client = new SmtpClient();
//client.Host = "localhost";
//client.Port = 25;
//client.Send("steve@somewhere","bob@gmail.com","Hey this is first app","Lunch at Lemeadian");

}

protected void Button1_Click(object sender , EventArgs e)
{
Button myButton = (Button)sender;

myButton.Text = (Int32.Parse(myButton.Text) + 1).ToString();



}
protected void ImageButton1_Command(object sender, CommandEventArgs e)
{

}
protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
{
if(e.X>100 && e.Y>200)
spannow.InnerText +="
"+ e.X.ToString();

spannow.InnerText += "
" + e.Y.ToString();
}
protected void TextBox1_TextChanged(object sender, EventArgs e)
{
Label1.Text = TextBox1.Text;
}
protected void RadioButton1_CheckedChanged(object sender, EventArgs e)
{
RadioButton rbtCommon = (RadioButton)sender;
if (rbtCommon.Checked == true)
Label1.Text = "i am in " + rbtCommon.ID.ToString();
}
}