protected void btnRemoveSelectedSubject_Click(object sender, EventArgs e)
{
BaseHandler bh = new BaseHandler();
Subject s = bh.FindSubject(Language, Convert.ToInt32(hdnNodeSubjectId.Value));
if (s.children.Count == 0)
{
bh.DeleteSubject(Convert.ToInt32(hdnNodeSubjectId.Value));
lblCannotDelete.Visible = false;
}
else
lblCannotDelete.Visible = true;
BindTree();
}