private void sGeneralCodeLop_MonHoc() { DataTable tb = new DataTable(); tb = boLop.getLOP_MONHOC_LastCode(); string lCode = String.Empty; if (tb.Rows.Count == 0) { lCode = "000000"; } else if (tb.Rows.Count > 0) { lCode = tb.Rows[0]["LastCode"].ToString(); } txtMonLopCode.Text = ("MOL" + quydinh.LaySTT(int.Parse(lCode.ToString()) + 1)).ToString(); sStatust = int.Parse(lCode.ToString()); }