public RedirectToRouteResult AddWaterbillToCheckout(Checkout order, WaterBill waterBill, string returnUrl) { if (waterBill != null) { if (order.chosenTariff == null) { order.chosenTariff = tariffRepo.Tariffs .FirstOrDefault(p => p.Id != null); } order.InitCalc(new ValueCalculator()); order.SetWater(waterBill); } return RedirectToAction("Index", new { returnUrl }); }