A question concerning BackgroundWorker

I've just came across the following phrase on the internet (actually here http://www.albahari.com/threading/part3.aspx#_Using_BackgroundWorker) "code within a RunWorkerCompleted event handler is able to upda开发者_开发技巧te user interface controls without explicit marshaling".

Could anybody explain why doesn't code in this event handler need to be marshalled to main UI thread?

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It's marshaled. You just don't have to do any explicit marshaling. That is, you don't have to write the marshaling code yourself. It's done automatically by the BCL code.