It shouldn't. You might have managed to add two subscriptions to the same
event, both pointing to the same method. This can happen if you run the code
that creates a subscription without removing any preexisting subscriptions
first.
Hi - I have a hazy memory of seeing this some years ago when I wrote a
program using FileSystemWatcher. It had something to do with the
application which was creating the file - maybe it was somehow
initiating 2 "create events" or something. Sorry I can't remember more,
but I'm sure you can find some help via Google.... :-|