C# How to close a windows form on the main UI thread from another thread?

The best thing to do in this situation, is before you actually invoke the closing of the form, you notify all your systems you are going to close, which will give you the opportunity to run any process at the end. When you are then finished and want to close the form from the other thread, you will need to call it on the UI thread using.

I suggest you to use the BackgroundWorker class. Follow this sample.

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