How to iterate through Folders and sub folders of a Sharepoint Document Library using web references

I am trying to access Folder names from Document Libraray using web services in C#. I am to get the first level fol开发者_如何学Cder names using getlistitems. Howvever i am not able to get sub folders and documents. Can any body help me with this.

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Use SiteData's EnumerateFolder method

http://msdn.microsoft.com/en-us/library/ms774758.aspx