private void HienThiDonHang() { DonHangBUS donHangBUS = new DonHangBUS(); donHangBUS._nguoiDung = _NguoiDungHienTai; try { donHangBUS.SelectByIdNguoiDung(); } catch { Response.Redirect("Trangloi.aspx"); } gridviewOrders.DataSource = donHangBUS.KetQua; gridviewOrders.DataBind(); }