PleaseWaitButton ASP.NET Server Control 2.0

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

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

    }
    protected void PleaseWaitButton1_Click(object sender, EventArgs e)
    {
        for (int i = 0; i == 10; i++)
        {
            System.Threading.Thread.Sleep(1000);
        }
        Response.Redirect("http://www.yahoo.com", true);
    }
}