public CarSparePart SaveCarSparePart(CarSparePart cs)
        {
            CarDbContext db   = new CarDbContext();
            var          list = db.CarSpareParts.ToList();

            if (list.Contains(list.Find(x => (x.CarMarkId == cs.CarMarkId) && (x.SparePartId == cs.SparePartId))))
            {
                return(cs);
            }
            db.CarSpareParts.Add(cs);
            db.SaveChanges();
            return(cs);
        }
        public ActionResult CreateCarSparePart(EditModel e)
        {
            if (!ModelState.IsValid)
            {
                return(View("Index", e));
            }
            var cs = new CarSparePart
            {
                CarMarkId   = e.SelectedCarMarkId,
                SparePartId = e.SelectedSparePartId
            };

            SaveCarSparePart(cs);
            return(RedirectToAction("Index"));
        }