Aborting a session while it's still putting files (VB.NET)

Hi,
I'm using the .NET assembly in VB2010 to put files to remote servers. Some of the files are quite large (video files).
If I want to interrupt the transfer midway while uploading a file, is there any way to do that?
I've tried using FileTransferProgress and aborting or disposing the session during that event, but it doesn't seem to work properly.
I thought maybe there is some specific method or event for doing this.

Any help would be much appreciated.
Regards.

By aborting, do you mean Session.Abort? That should work. If not please attach both debug (Session.DebugLogPath) and session logs (Session.SessionLogPath).