Session timeout checking in ASP.NET

public class SessionDemo : System.Web.UI.Page
 {
    public SessionDemo()
    {
    }

	override protected void OnInit(EventArgs e)
    {
	     base.OnInit(e);


	   if (Context.Session != null)
	   {

	    if (Session.IsNewSession)
	    {
		 string szCookieHeader = Request.Headers["MyCookie"];
	     if ((null != szCookieHeader) && (szCookieHeader.IndexOf("ASP.NET_SessionID") >= 0))
		 {
	      Response.Redirect("TimeoutPage.htm");
	     }  
	    } 
	   }
  }
}