protected void btnLuu_Click(object sender, EventArgs e)
        {
            string UserID  = Session["user"].ToString();
            string congty  = Session["congty"].ToString();
            string maphieu = Session["MaPhieu"].ToString();
            int    YN      = 4;

            try
            {
                if (txtPhanHoi.Text.Trim() != "")
                {
                    dalAbcon.CapNhatTraLoi(maphieu, congty, UserID, txtNguoiChoDuyetID.Text.Trim(), txtPhanHoi.Text.Trim());
                }

                dal.CapNhatPhieuCoYKienToiNguoiDuyet1(txtTieuDeTW.Text.Trim(), txtTieuDe.Text.Trim(), maphieu, UserID, congty, YN);

                dalAbcon.CapNhatTrangThaiCuaPhieuCoYKien(maphieu, congty, YN, txtNguoiChoDuyetID.Text.Trim());
            }
            catch
            {
                throw;
            }
            btnEdit.Enabled = true;
            btnEdit.Attributes.CssStyle.Add("opcity", "100");
            btnLuu.Enabled = false;
            btnLuu.Attributes.CssStyle.Add("opcity", "0.5");
            Response.Redirect("DanhSachPhieuChuaDuyetBiTraVe.aspx");
        }