void loadChiTietHoaDon()
{
DAOTable ban = new DAOTable();
DAOHoaDon hd = new DAOHoaDon();
DAOChiTietHoaDon ct = new DAOChiTietHoaDon();
if (ban.KTBanDangSD(Globals.Maban))
{
dtg_chitiet.DataSource = ct.getChiTietHoaDon(Globals.Mahoadon);
dtg_chitiet.AllowUserToAddRows = false;
txt_tongtien.text = hd.getTongbill(Globals.Mahoadon).ToString();
}
}