Account Activate Page Redirect Problem

 Hi,
I have made Activate.aspx page
In page load I have written Like This

 
using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;
using System.Text.RegularExpressions ;
public partial class Activate : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
...