Thanks for pointing this out - this will be fixed in 1.1.0, due out in the next few days.
Just to whet appetites a little - 1.1.0 is basically a rewrite, with loads of new features:
- FTPFile objects returned from directory listings, so you can easily obtain remote file/directory details
- message listener interface for collecting FTP messages
- progress monitor interface
- lots of minor fixes and enhancements
FTPException class should inherit from System.ApplicationException instead of System.Exception.