private void btnXoa_Click(object sender, EventArgs e)
{
try
{
DeTai detai = DeTaiController.getExistDT(listDeTai.SelectedItems[0].SubItems[0].Text.Trim());
this.listDeTai.SelectedItems[0].Remove();
DeTaiController.DeleteDeTai(detai);
}
catch { }
}
