C# - Cannot append text to control from background threads using Invoke()?

You are waiting for the worker threads to complete before leaving your button1_Click method. This is a problem because your threads can't complete until they are able to run the delegate that calls the AppendText method on that same thread.

The Invoke method runs your delegate synchronously—it waits until the UI thread actually runs it before returning control to the caller. Since the UI thread is waiting for your threads to finish, you get a deadlock.

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