protected void btnLuuChu_Click(object sender, EventArgs e)
 {
     if ((ThaoTac)Session["ThaoTac"] == ThaoTac.ThemMoi)
     {
         bool kq = don.ThemChuDuBi(Session["MaDon"].ToString(), drDanhXung.Text, txtHoTen.Text, txtNamSinh.Text, txtDiaChi.Text, txtDinhDanh.Text, txtSoDinhDanh.Text, txtNoiCap.Text, txtNgayCap.Text, txtQuocTich.Text);
     }
     else if ((ThaoTac)Session["ThaoTac"] == ThaoTac.DangSua)
     {
         bool kq = don.SuaChuDuBi(lblMaChu.Text.Replace("Mã chủ: ", " ").Trim(), drDanhXung.Text, txtHoTen.Text, txtNamSinh.Text, txtDiaChi.Text, txtDinhDanh.Text, txtSoDinhDanh.Text, txtNoiCap.Text, txtNgayCap.Text, txtQuocTich.Text);
     }
     LoadgrvChu();
     Session["ThaoTac"] = ThaoTac.KhongNhap;
     ApDungTrangThai();
 }