public IQueryable<Car> GetCarsByCarModel(CarModel model)
        {
            if (model == null)
                return null;

            return db.Cars.Where(x => x.CarModel.ID == model.ID);
        }
        public void Update(CarModel carModel)
        {
            CarModel rCarModel = GetCarModelById(carModel.ID);
            if (rCarModel == null)
                return;

            rCarModel.Cars = carModel.Cars;
            rCarModel.Name = carModel.Name;
            rCarModel.Range = carModel.Range;
            rCarModel.Website = carModel.Website;
            rCarModel.Year = carModel.Year;
            db.SaveChanges();
        }
 public void Insert(CarModel carModel)
 {
     db.CarModels.Add(carModel);
     db.SaveChanges();
 }