How to advance a progress bar from a recursive method while avoiding threading issues?

It would actually be better to use recursion to find all of the work you need done, then set up the BackgroundWorker then start the work in a non-recursive loop, updating progress as needed, then close out the BackgroundWorker .

The problem is that you are invoking the same background worker for each iteration of the directory walk. All you need is one background worker that actually does the work. The entire recursive walk should be contained within a single call to DoWork (instead of each sub-directory scan).

Then you just have the main UI thread updating your progress bar.

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