public partial class TreeView : System.Web.UI.Page
    {
        DataTable dt = new DataTable();
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                dt.Columns.Add("a1");
                dt.Columns.Add("a2");
                dt.Columns.Add("a3");
                dt.Columns.Add("num", Type.GetType("System.Int32"));
                dt.Columns.Add("url");
                dt.Rows.Add(new object[] { "1", "0", "我的文件夹", 2, "http://www.sina.com.cn" });
                dt.Rows.Add(new object[] { "2", "0", "工作文件夹", 1, "http://www.baidu.com" });
                dt.Rows.Add(new object[] { "3", "1", "图片", 1, "http://www.qq.com" });
                dt.Rows.Add(new object[] { "4", "1", "文档", 2, "http://www.hao123.com" });
                dt.Rows.Add(new object[] { "5", "3", "风景", 2, "http://www.163.com" });
                dt.Rows.Add(new object[] { "6", "3", "人物", 1, "http://bbs.csdn.net" });
                dt.Rows.Add(new object[] { "7", "2", "报告", 1, "http://www.taobao.com" });
                dt.Rows.Add(new object[] { "8", "3", "写真", 3, "http://www.liuzhou.gov.cn" });

                bindData("0", TreeView1.Nodes, "根目录");
            }
        }
        private void bindData(string parentid, TreeNodeCollection tnc,string path)
        {
            DataRow[] ary_row = dt.Select("a2=" + parentid, "num");
            foreach (DataRow item in ary_row)
            {
                TreeNode node = new TreeNode();
                string txtpath = path + "//" + item["a3"].ToString();
                node.Text = string.Format("<font onclick=\"selval(this,'{1}','{2}')\" style=\"cursor:pointer;\">{0}</font>", item["a3"].ToString(),  item["url"].ToString(),"Right");
                node.Value = item["a1"].ToString();
                node.Expanded = true;//是否展开
                //node.ShowCheckBox = true;//是否显示选择框
                node.SelectAction = TreeNodeSelectAction.None;
                //node.NavigateUrl = "javascript:selval('" + txtpath + "');";//连接路径
                //node.SelectAction = TreeNodeSelectAction.Expand;//选择事件
                tnc.Add(node);
                bindData(item["a1"].ToString(), tnc[tnc.Count - 1].ChildNodes, txtpath);
            }
        }
    }