关于树的绑定问题

前台代码
<asp:TreeView ID="tvDataPower" runat="server" ShowCheckBoxes="All">
  </asp:TreeView>

后台代码
  public void InitleftG()
        {
            using (DownloadCenterEntities db = new DownloadCenterEntities())
            {

                List<DataClass> llist = (from u in db.DataClass
                                         orderby u.DispOrder
                                         where u.ParentClassID == 0
                                         select u).ToList();

                for (int i = 0; i < llist.Count; i++)
                {
                    DataClass lb = llist[i];
                    TreeNode roon = new TreeNode();
                    roon.Text = lb.ClassName;
                    roon.Value = lb.ClassID.ToString();
                    InitleftZ(roon);
                    this.tvDataPower.Nodes.Add(roon);

                }
                this.tvDataPower.ExpandAll();
            }
        }

        public void InitleftZ(TreeNode Pid)
        {
            using (DownloadCenterEntities db = new DownloadCenterEntities())
            {
                int fjdid = int.Parse(Pid.Value);
                List<DataClass> zlist = (from u in db.DataClass
                                         orderby u.DispOrder
                                         where u.ParentClassID == fjdid
                                         select u).ToList();
                for (int i = 0; i < zlist.Count; i++)
                {
                    DataClass fl = zlist[i];
                    TreeNode zroon = new TreeNode();

                    zroon.Text = fl.ClassName;
                    zroon.Value = fl.ClassID.ToString();
                    //添加到当前父亲节点下
                    Pid.ChildNodes.Add(zroon);
                    //添加子节点的孩子结点,递归调用
                    InitleftZ(zroon);
                }
            }
        }

现在是初始化的时候
如果有权限就让checkbox=true
create table DataClass
(
ClassID int primary key identity(1,1) not null,
ClassName varchar(50) not null,
DispOrder int null,
ParentClassID int not null
)

--------------------编程问答--------------------   Private Sub CreateChildTree(ByVal ParentNode As System.Web.UI.WebControls.TreeNode)

        ParentNode.Expanded = False
        Try
            Dim dv As DataView = GetSubAccFunctions(ParentNode.Value)
            Dim i As Integer
            For i = 0 To dv.Count - 1
                Dim myTreeNode As New System.Web.UI.WebControls.TreeNode()
                myTreeNode.Text = dv(i)("AccessFunctionDesc")
                myTreeNode.Value = dv(i)("AccessSubFunctionID")

                ParentNode.ChildNodes.Add(myTreeNode)

                If dv(i)("HasChildren") Then
                    CreateChildTree(myTreeNode)
                End If

            Next
        Catch ex As Exception
            Throw
        Finally

        End Try
    End Sub

补充：.NET技术 ,  ASP.NET