DataSet ds = BaseClass.BindTreeByF_MODALITY_ID(F_MODALITY_ID);
            TreeNode root1 = new TreeNode();
            root1.Text = F_STU_PLACE;
            root1.Expanded = true;//默认不展开节点
            root1.SelectAction = TreeNodeSelectAction.None;
            TreeView1.Nodes.Add(root1);//固定第一个根节点

            DataTable tab = ds.Tables[0]; //动态获取子节点数据        
            TreeNode root;//声明一个节点
            foreach (DataRow dr in tab.Rows)//递归动态绑定子节点
            {
                root = new TreeNode();//实例化节点
                root.Value = dr[id].ToString();
                root.Text = dr[text].ToString();//设置子节点的文本
                //root.PopulateOnDemand = true;
                //root.SelectAction = TreeNodeSelectAction.None;
                //root.NavigateUrl = dr[id].ToString();
                root1.ChildNodes.Add(root);//将子节点添加到根节点中
            }

 <asp:TreeView ID="TreeView1" runat="server" ImageSet="Msdn" NodeIndent="10" ShowLines="true" ExpandDepth="0" OnSelectedNodeChanged="TreeView1_SelectedNodeChanged">
            <ParentNodeStyle Font-Bold="false"/>
            <NodeStyle Font-Names="Verdana" ForeColor="Black" HorizontalPadding="5px" NodeSpacing="1px" VerticalPadding="2px"/>
            <SelectedNodeStyle ForeColor="white" BackColor="#4a5bb1" />
        </asp:TreeView>