public IActionResult Add()
        {
            CarHelperModel model = new CarHelperModel
            {
                MakeCollection = this.carService.GetMakes(),
                Parts          = this.partService.GetAll()
            };

            return(this.View(model));
        }
        public IActionResult Add(CarHelperModel model)
        {
            if (!this.ModelState.IsValid)
            {
                model.MakeCollection = this.carService.GetMakes();
                model.Parts          = this.partService.GetAll();
                return(this.View(model));
            }

            this.carService.Add(model.Car.Make, model.Car.Model, model.Car.TravveledDistance, model.Car.Parts);
            return(this.Redirect($"/Cars/{model.Car.Make}"));
        }