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Editorial Team
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Asked: 2026-05-21T06:58:05+00:00

Using C# Windows.Forms, do the methods Invalidate(), Refresh(), etc. have to be run on

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Using C# Windows.Forms, do the methods Invalidate(), Refresh(), etc. have to be run on the main/GUI thread (require Invoke/BeginInvoke)? How about changes to members of a GUI object such as adding/deleting Points or changing the Color of a Series in a Charting.Chart object?

I have some of these changes occuring in a worker thread without any issues (so I guess they are ok?), but I’m trying to distinguish which changes are explicity required on the GUI thread and which changes can occur on the object in a worker thread. Does anyone have a link or book reference to guidance on this subject?

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  1. Editorial Team

    In general, you should typically assume that ALL changes to GUI elements should be made on the UI thread.

    Often, changes on a background thread will work during testing, but break post-deployment. In general, unless otherwise documented, it’s much safer to assume that everything should be on the UI thread.

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