protected void btLuuCt_Click(object sender, EventArgs e)
{
int ma = int.Parse(lbMadh.Text);
DAO_Entity daokh = new DAO_Entity();
DTODonDatHang dtodh = new DTODonDatHang();
DTOChiTietDonHang dtoct = daokh.LayTongTien(ma);
dtodh.TongTien = int.Parse(dtoct.ThanhTien.ToString());
dtodh.CongNoDH = dtodh.TongTien;
daokh.CapNhatTongTien(dtodh);
Response.Redirect("~/QLBoPhan_TiepXucKH/TaoDonHang.aspx?MaKH="+lbMaKH.Text);
}