The BeginInvoke() method has a IAsyncResult type return value and the Invoke() method simply return a object. This makes a big difference between them which is the BeginInvoke() is making a asynchronous callback to the thread created the handle of the control.
Assuming the main thread is A and currently executing code is in thread B, if call Invoke() from thread B then thread B has to wait for the callback to thread A being finished and then continue the following process.
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