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Editorial Team
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Asked: 2026-06-16T02:41:05+00:00

Let’s assume that the code running in the thread that instantiated the form/control/element (usually

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Let’s assume that the code running in the thread that instantiated the form/control/element (usually the main thread) does not modify/access that element at the same time, is it possible to:

  1. get the Text property of a TextBox.

  2. enumerate a ListView.

  3. subscribe to a Form’s Closing event. (Knowing that the hook will be called from the thread that instantiated that form)

I have tried all 3 and the program doesn’t seem to complain about it. I had always thought that you had to invoke any call that wants to even remotely touch anything UI related (read or write).

I understand very clearly why I need to use the IsInvokeRequired/Invoke pattern when modifying an element, but I cannot see why accessing properties/events would cause any problems.

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1 Answer

  1. Editorial Team

    It’s definitely possible, however, it could lead to unexpected behaviour. Also, other thread-related bugs also need to be taken into consideration e.g. race conditions/deadlocks see Managed Threading Best Practises.

    I would always stick to accessing the UI on the UI thread to be on the safe side.

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