I want to correct a few things:
callbacks are processed by the same worker thread. however after it is done, it tries to invoke a Completed event in the caller thread which is the problem.
btw, this article might be useful for you since you are writing a GUI appl.
CoDe Magazine - Article: Asynchronous Windows Forms Programming
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"Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it."
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