First ASP.NET Program

Asp.net is a web development tool,developed by Microsoft.It is different to ASP(Active Server Page).NET framework Provide environment to Develop and deploy Web Application.

AutoEventWireup:: It is attribute of page,Two values True & False.If true then the page framework call the events automaticaly.The methods Page_init,Page_load.If False then designer genrate explicit code to bind page event and method. 
runat="server":: This attribute indicates that the form should be processed on the server. 
Div Tag:: Used to group block-elements to format them with styles.

 Design Code:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Hello.aspx.cs" Inherits="_Default" %>

.CS Code:

using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Xml.Linq; 
public partial class _Default : System.Web.UI.Page { 
	protected void Page_Load(object sender, EventArgs e) { }
	protected void Show_Click(object sender, EventArgs e) 
	{ 
              ShowData.Text = "Hello"; }
	}