public ActionResult AddProduct(Product product) { ProductDetail productDetail = product.ProductDetail; productDetail.masanpham = pro.ma; pro.ProductDetail = productDetail; dao = new ProductsDao(); bool check = dao.AddProduct(pro); if (check) { return(RedirectToAction("ProductManager", "HomeAd")); } else { return(JavaScript("<script>alert(\"Mã sản phẩm đã tồn tại\")</script>")); } }