public ActionResult AddToCart(Guid t_guid) { Guid guid = Guid.NewGuid(); var user_id = User.Identity.GetUserId(); var getTravel = _tr.SelectTravel(t_guid); bool check = _tr.CheckFavorite(t_guid, user_id); if (check == false) { _tr.AddCart(guid, user_id, t_guid); return(RedirectToAction("Index", new { Guid = t_guid })); } return(RedirectToAction("Index", new { Guid = t_guid })); }