private void listBox_lv2_SelectedIndexChanged(object sender, EventArgs e)
{
if (listBox_lv1.SelectedIndex != -1 && listBox_lv2.SelectedIndex != -1)
{
consMgr.setExamLv3(listBox_lv3, int.Parse(((PermissibleValueObj)(listBox_lv1.SelectedItem)).Value), int.Parse(((PermissibleValueObj)(listBox_lv2.SelectedItem)).Value));
if (listBox_lv3.Items.Count == 1)
{
listBox_lv3.SelectedIndex = 0;
}
}
}
