public bool IsAuthenticated()
        {
            if (Session != null && Session["UserRole"] != null)
            {
                return true;
            }
            return false;
        }

public ActionsResult Index() {
    if(!login.IsAuthenticated()){
      return RedirectToAction("Index","Login");
    }
    return View();
}

public ActionsResult Index() {
      if (Session == null && Session["UserRole"] == null)
            {
                 return RedirectToAction("Index","Login");
            }
    return View();
}