VB.Net Directory Move

Hi

I am trying to move a directory to a done folder after my processing is
over. I am using Directory.Move which doesn't seem to work for already
existing destination folder c:\\done. The processing is
being done in a loop and once each folder is done processing, they need to be
moved to the done folder. Can someone please tell me how to get this done in
VB.net?

Thanks in advance,
Roy