6位层次编码驱动动态加载TreeView

        protected void Page_Load(object sender, EventArgs e)
        {
            //进入页面，则刷新树结构
            if (!Page.IsPostBack)
            {
                AddNodeOne();
            }

        }
        //添加一层节点
        protected void AddNodeOne()
        {
            string WZDL = "SELECT WZDM,WZMC FROM XTWZDM WHERE WZDM LIKE '%0000'";
            SqlDataAdapter ADOne = new SqlDataAdapter(WZDL, conn);
            DataSet DSOne = new DataSet();
            ADOne.Fill(DSOne);
            foreach (DataRow ROWOne in DSOne.Tables[0].Rows)
            {
                TreeNode NODEOne = new TreeNode();
                NODEOne.PopulateOnDemand = true;
                TVWZDM.Nodes.Add(NODEOne);
                NODEOne.Value = ROWOne[0].ToString();
                NODEOne.Text = ROWOne[0].ToString() + ' ' + ROWOne[1].ToString();
                NODEOne.Expanded = false;
                NODEOne.SelectAction = TreeNodeSelectAction.Expand;
            }


        }
        //添加二层节点