I show how to render  a simple TreeView that represents the hierarchy of sites in
the currently Site Collection in my SharePoint developer class. However, it
isn't really any different than using the TreeView in any other setting (e.g.
User Control, Server Control, ASP.NET page). There are tons of examples of how
to render the TreeView class:
http://tinyurl.com/3dh2u8

Thanks for your reply. I can' tget into http://tinyurl. com/3dh2u8 . I
appreciate if you give me one example or direct me to somewhere. All examples I
have seen is how to use treeview  user control. I am ready to buy those 10-20
lines of the code!