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Why do I not see the presence of BeginInvoke and EndInvoke methods in Delegate class?

I can see BeginInvoke and EndInvoke methods are available for any delegate. But I don't see them defined anywhere in "Delegate" and "MulticastDelegate" classes. Where are they present?

From MSDN :

The common language runtime provides each delegate type with BeginInvoke and EndInvoke methods, to enable asynchronous invocation of the delegate. For more information about these methods, see Calling Synchronous Methods Asynchronously .

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