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();
}
