public JsonResult IsPerkTaskExist(string key, long id) { TittleUserServices service = new TittleUserServices(); bool isExist = false; perks_tasks data = service.GetPerkTaskByKey(key); if (data == null) { isExist = false; } else if (data.id == id) { isExist = false; } else { isExist = true; } return(Json(!isExist, JsonRequestBehavior.AllowGet)); }