Showing directory structure in TreeView form

[mahen_kulkarni]

Hello,
I need some help with TreeView control.
How to show directory structure using TreeView control?
I know the starting directory. For example if starting directory is "C:\Program Files" , treeview control should show "Program Files" as root node of tree and it's all subfolders(and it's subfolders in turn) and all files as rest of the tree nodes.
please help ....
- Mahendra