private bool check_loai_pc_dang_su_dung(decimal ip_id_loai_pc) { US_GD_NHAN_VIEN_PHU_CAP v_us = new US_GD_NHAN_VIEN_PHU_CAP(); DS_GD_NHAN_VIEN_PHU_CAP v_ds = new DS_GD_NHAN_VIEN_PHU_CAP(); v_us.FillDataset(v_ds, "where id_phu_cap =" + ip_id_loai_pc); if (v_ds.Tables[0].Rows.Count == 0) return false; return true; }