public string CheckIDLH(string id) { if (id != null || id != "") { LopHocBLL ql = new LopHocBLL(); return(ql.CheckMaLH(id).ToString()); } return("true"); }
private void BtnTaiDanhSachLop_Click(object sender, EventArgs e) { LopHocBLL bll = new LopHocBLL(); gvLopHoc.DataSource = bll.GetAlllop(); }