public ActionResult add_nsx([Bind(Include = "ten_nsx,SDT,email,dia_chi")] nsx n)
 {
     db.Database.ExecuteSqlCommand("insert_nsx @ten_nsx,@sdt,@email,@dia_chi",
                                   new SqlParameter("@ten_nsx", n.ten_nsx),
                                   new SqlParameter("@sdt", n.SDT),
                                   new SqlParameter("@email", n.email),
                                   new SqlParameter("@dia_chi", n.dia_chi)
                                   );
     return(RedirectToAction("danh_sach_nsx"));
 }
        public ActionResult Edit_nsx(string id)
        {
            nsx n = db.nsxes.FirstOrDefault(m => m.id_nsx == id);

            return(View(n));
        }