private bool check_loai_hd_dang_su_dung(decimal ip_id_loai_hd)
{
US_GD_HOP_DONG v_us = new US_GD_HOP_DONG();
DS_GD_HOP_DONG v_ds = new DS_GD_HOP_DONG();
v_us.FillDataset(v_ds, "where id_loai_hop_dong =" + ip_id_loai_hd);
if (v_ds.Tables[0].Rows.Count == 0)
return false;
return true;
}