Why does System.Threading.Timer callback successfully update UI?

Posted by Geo P on Stack Overflow See other posts from Stack Overflow or by Geo P
Published on 2012-06-04T16:31:25Z Indexed on 2012/06/04 16:43 UTC
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multithreading

I have several System.Threading.Timers on my form application with callbacks that update the UI...successfully - i.e. without throwing errors.

I had built these earlier, before I knew that UI should not be updated on any thread other than the UI thread.

Now I am confused as to why it does not throw cross-thread exceptions when I am updating UI on these separate threading.timer threads?

I will be changing these callbacks so that the UI updates are invoked on UI thread, but I am curious as to why this works.

Edit: My application is a WinForms Application.

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