protected void Page_Load(object sender, EventArgs e)
 {
     if (!IsPostBack)
     {
         TNode     tnode   = new TNode();
         NodeBLL   nodebll = new NodeBLL();
         DataTable dt      = nodebll.GetAllNode();
         L_CateTree.Text = NodeTree.GetJqueryNodeTree(dt, 0);
     }
 }