The Tree I was use it
<iewc:treeview id="TreeView1" runat="server" selectexpands="True" xmlns:iewc="#unknown"></iewc:treeview>
I replace it with :
<pre lang="HTML"><asp:treeview id="TreeView1" runat="server" showcheckboxes="Leaf" xmlns:asp="#unknown">
ShowLines="True"></asp:treeview>
and modifying the code as required