public ActionResult Delete(DeleteProductFormModel model)
        {
            var sanpham = db.SANPHAMs.FirstOrDefault(m => m.MaSP == model.MaSP);

            if (sanpham == null)
            {
                return(RedirectToAction("Index", "Product"));
            }

            db.SANPHAMs.Remove(sanpham);

            db.SaveChanges();

            return(RedirectToAction("Index", "Product"));
        }
        public ActionResult Delete(int masp)
        {
            var sanpham = db.SANPHAMs.FirstOrDefault(m => m.MaSP == masp);

            if (sanpham == null)
            {
                return(RedirectToAction("Index", "Product"));
            }

            var xoa = new DeleteProductFormModel();

            xoa.MaSP  = sanpham.MaSP;
            xoa.TenSP = sanpham.TenSP;
            return(View(xoa));
        }