I have this:

                oSftp.BeginDownload(lcFile, "d:\", _
                 Rebex.IO.TraversalMode.Recursive, Rebex.IO.TransferMethod.Copy, Rebex.IO.ActionOnExistingFiles.ThrowException, _
                 New AsyncCallback(AddressOf DownloadCallback), Nothing)

If I execute this line a second time, this will fire two calls to DownloadCallback.

Basically, once I am finished with it, I need to remove that handler from there. Is there a way to do it?