protected void Page_Load(object sender, EventArgs e) { TreeNode tmpNd; tmpNd = new TreeNode(); tmpNd.Value = "0"; tmpNd.Text = "网站专题"; tmpNd.NavigateUrl = ""; tmpNd.Target = ""; tvNav.Nodes.Add(tmpNd); B_SpecCate bll = new B_SpecCate(); bll.TreeNode(tmpNd.ChildNodes); tvNav.ExpandAll(); }