protected void btnLuu_Click(object sender, EventArgs e)
        {
            dsThanhPhamChon = (List <DTOChiTietDH>)Session["dsThanhPhamChon"];
            try
            {
                string        maDH       = DateTime.Now.ToString("yyyyMMddHHmmss");
                DTODonDatHang dtoDonHang = new DTODonDatHang();
                int           tongtien   = 0;
                foreach (DTOChiTietDH row in dsThanhPhamChon)
                {
                    tongtien += row.ThanhTien;
                }
                dtoDonHang.MaDH      = maDH;
                dtoDonHang.MaKH      = int.Parse(lbMaKH.Text);
                dtoDonHang.NgayTaoDH = Convert.ToDateTime(txtNgayTaoDH.Text);
                dtoDonHang.NgayGH    = Convert.ToDateTime(txtGiao.Text);

                dtoDonHang.TongTien  = 0;
                dtoDonHang.CongNoDH  = 0;
                dtoDonHang.TongTien  = tongtien;
                dtoDonHang.CongNoDH  = tongtien;
                dtoDonHang.TrangThai = "Chưa Xử Lý";

                //XuLy_TiepNhanDonHang control = new XuLy_TiepNhanDonHang();
                //control.themdh(dtoDonHang);

                if (daoEntities.ThemDonHang(dtoDonHang))
                {
                    foreach (DTOChiTietDH dtoCTDH in dsThanhPhamChon)
                    {
                        dtoCTDH.MaDH = maDH;

                        //control.themct(dtoCTDH);

                        if (daoEntities.ThemChiTietDH(dtoCTDH))
                        {
                            Session["dsThanhPhamChon"] = null;
                        }
                    }
                }
                Response.Redirect(Request.RawUrl);
            }
            catch (Exception)
            {
                throw;
            }
        }
        public void themct(DTOChiTietDH dtoCTDH)
        {
            DAO_Entity dao = new DAO_Entity();

            dao.ThemChiTietDH(dtoCTDH);
        }