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Editorial Team
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Asked: 2026-05-20T18:06:29+00:00

I’m writing a simple winforms app in C#. I create a worker thread and

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I’m writing a simple winforms app in C#. I create a worker thread and I want the main window to respond to the tread finishing its work–just change some text in a text field, testField.Text = “Ready”. I tried events and callbacks, but they all execute in the context of the calling thread and you can’t do UI from a worker thread.

I know how to do it in C/C++: call PostMessage from the worker thread. I assume I could just call Windows API from C#, but isn’t there a more .NET specific solution?

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1 Answer

  1. Editorial Team

    In the event callback from the completed thread, use the InvokeRequired pattern, as demonstrated by the various answers to this SO post demonstrate.

    C#: Automating the InvokeRequired code pattern

    Another option would be to use the BackgroundWorker component to run your thread. The RunWorkerCompleted event handler executes in the context of the thread that started the worker.

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