VS2008: treeview, provide access according to user's permission, how?

I've never worked with Treeview before, but need to provide a folder structure (based on the physical folder structure) to the user.  The user can only see their folder structure that is determined by their permission. How does this need to be set up?
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newbiealAuthor Commented:
Thanks,but it does not cover what I am looking for.  In my case the Treeview needs to populate the information based on the physical folder structure on a harddrive (therefore there is no xml, db, etc. involved).
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