Creation of Chat Box in C#

Creation of 'Chat Box' in C#

using System;

using System.Collections.Generic;
using System.Linq;
// you have to add these namespaces for creation and for web control
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default3 : System.Web.UI.Page

{
protected void Page_Load(object sender, EventArgs e)
{
// its on you

}

protected void Button1_Click(object sender, EventArgs e)
{

Window1.Visible = true;
}
private string Chat
{
get
{
if (Application["a"] == null)
Application["a"] = "";
return Application["a"].ToString();
}

set

{
Application["a"] = value;
}
}

protected void Timer1_Tick(object sender, EventArgs e)

{
Label1.Text = Chat;
}

protected void Button2_Click(object sender, EventArgs e)
{

Chat = TextBox1.Text + "<br/>" + Chat;
}
}