public ActionResult TraCuuDonHang(string maHopDong)
 {
     if (maHopDong != null)
     {
         ViewBag.KhachHangDat   = KhachHangQueries.TimKhachHang(maHopDong);
         ViewBag.TimKiemHopDong = HopDongQueries.TimHopDong(maHopDong);
     }
     return(View());
 }