public ActionResult Detail(int id)
{
var dao = new OrderDetailDao();
var model = dao.Detail(id);
int product_id = int.Parse(model.FirstOrDefault().ProductID.ToString());
var product_dao = new ProductDao();
var product_model = product_dao.ViewDetail(product_id);
ViewBag.Quantity = int.Parse(model.FirstOrDefault().Quantity.ToString());
return(View(product_model));
}