private void validatePageAuthentication()
 {
     if (Request.Params["pagecode"] != null)
     {
         if (Request.Params["pagecode"] != "")
         {
             UserAuthentication userAuthentication = new UserAuthentication();
             if (!userAuthentication.IsAuthorizeForThisPage(Context.User.Identity.Name, Request.Params["pagecode"].ToString()))
             {
                 Response.Redirect("~/NoPermission.aspx");
             }
         }
     }
 }