public async Task <ActionResult> AddGroceryToGroceryList(int id) { var grocery = await _groceryRepository.GetGroceryByIdAsync(id); if (grocery == null) { return(Json(JsonRequestBehavior.DenyGet)); } _groceryRepository.AddGroceryToGroceryListAsync(grocery); await NotifyClientsOnUpdateAsync(); return(Json(true, JsonRequestBehavior.AllowGet)); }