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Consider a hypothetical method of an object that does stuff for you: public class DoesStuff { BackgroundWorker _worker = new BackgroundWorker(); ... public void CancelDoingStuff() { _worker.CancelAsync(); //todo: Figure out a way to wait for BackgroundWorker to be cancelled. } } How can one wait for a BackgroundWorker to be done? In the past people have tried: while (_worker.IsBusy) { Sleep(100); } But this deadlocks , because IsBusy is not cleared until after the RunWorkerCompleted event is handled, and that event can't get handled until the application goes idle. The application won't go idle until the worker is done. (Plus, it's a busy loop - disgusting.) Others have add suggested kludging it into: while (_worker.IsBusy) { Application.DoEvents(); } The problem with that is that is Application.DoEvents() causes messages currently in the queue to be processed, which cause re-entrancy problems (.NET isn't re-entrant). I would hope to use some solution involving Event synchronization objects, where the code waits for an event - that the worker's RunWorkerCompleted event handlers sets. Something like: Event _workerDoneEvent = new WaitHandle(); public void CancelDoingStuff() { _worker.CancelAsync(); _workerDoneEvent.WaitOne(); } private void RunWorkerCompletedEventHandler(sender object, RunWorkerCompletedEventArgs e) { _workerDoneEvent.SetEvent(); } But I'm back to the deadlock: the event handler can't run until the application goes idle, and the application won't go idle because it's waiting for an Event. So how can you wait for an BackgroundWorker to fin

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