When using Parallel BeginInvoke is working while Invoke is not - c# 4.0?

Your UI thread will wait for Parallel. For to complete before it continues. That means it can't process any further UI messages until it's completed.

It sounds like you are deadlocking the UI thread. This makes perfect sense, as your button2_Click doesn't exit until For completes, and in particular, no message-loop events can be processed until button2_Click has completed. If you are on a different thread, Invoke uses a message-loop event, and does not return until that item is processed - so nothing will ever be done - and For / button2_Click will never complete.

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