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; }