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The UI thread in Winforms have the responsibility of running the message pump, by calling Application.Run. By message pump I mean an endless loop that keeps pulling messages out from the queue.
So now is my question, how can the UI thread also execute a block of code when ex. a click handler is triggered? It should be busy with the message pump, and not able to execute the code?
It takes time out of processing the message pump to handle the message, as this is synchronously called from the message pump (via the click event).
This is why expensive code can cause the UI to hang.