public RedirectToRouteResult AddTariffToCheckout(Checkout order, int TariffId, string returnUrl) { Tariff chosenTariff = tariffRepo.Tariffs .FirstOrDefault(p => p.Id == TariffId); if (chosenTariff != null) { order.InitCalc(new ValueCalculator()); order.SetTariff(chosenTariff); } return RedirectToAction("Index", new { returnUrl }); }