asp.net TreeView与XML三步生成列表树

刚我在做tree view 绑定时自己摸索了一下，网上有人说treeview绑定数据源，用什么递归绑定啥的，我不想看了，就自己试着写了一个
我是这样做的，如果有什么问题请大神指导，我是菜鸟额..
1:页面treeview 叫tvfunction
2:新建 adminfunction.xml

3：页面绑定

/// <summary>
        /// 初始化功能树结构
        /// </summary>
        private void initfunction()
        {
            xmldocument xmldoc = new xmldocument();
            string xmlpath = "~/adminfunction.xml";
            xmlpath = server.mappath(xmlpath);
            xmldoc.load(xmlpath);
            xmlnode root = xmldoc.documentelement;

            foreach (xmlnode node in root.childnodes)
            {
                //获取父节点的信息显示(轻狂-书生)
                xmlelement x1 = node as xmlelement;
                string name = x1.getattribute("name");
                string url = x1.getattribute("url");
                treenode tn = new treenode();
                tn.text = name;
                tn.navigateurl = url;
                foreach (xmlnode subnode in x1.childnodes)
                {
                    xmlelement subxmlemt = subnode as xmlelement;
                    string subname = subxmlemt.getattribute("name");
                    string suburl = subxmlemt.getattribute("url");
                    treenode subtn = new treenode();
                    subtn.text = subname;
                    subtn.navigateurl = suburl;
                    tn.childnodes.add(subtn);

                }
                tvfunction.nodes.add(tn);

            }
        }

4：显示效果