private bool check_loai_ngay_cong_dang_su_dung(decimal ip_id_loai_ngay_cong)
{
US_GD_CHAM_CONG v_us = new US_GD_CHAM_CONG();
DS_GD_CHAM_CONG v_ds = new DS_GD_CHAM_CONG();
v_us.FillDataset(v_ds, "where id_loai_ngay_cong =" + ip_id_loai_ngay_cong);
if(v_ds.Tables[0].Rows.Count == 0)
return false;
return true;
}