public IActionResult CarManage(int id)
        {
            CarManageModel carManageModel = new CarManageModel
            {
                client = _context.Client.Where(c => c.IdClient == id).ToList()[0],
                cars   = _context.Car.Where(car => car.IdClient == id).ToList()
            };

            return(View(carManageModel));
        }
        public async Task <IActionResult> CarManage(CarManageModel carManageModel)
        {
            if (carManageModel.carToAdd.NumberPlate == null)
            {
                return(View(carManageModel));
            }
            carManageModel.carToAdd.IdClient = carManageModel.client.IdClient;
            _context.Add(carManageModel.carToAdd);
            await _context.SaveChangesAsync();

            carManageModel.cars.Add(_context.Car.Where(c => c == carManageModel.carToAdd).ToList()[0]);
            TempData.Put <CarManageModel>("CarManageModel", carManageModel);
            ViewBag.Information = "Successfully added new car!";
            var id = carManageModel.client.IdClient;

            return(RedirectToAction("CarManage", id));
        }