asynchronous function call

Hello everyone,

I am learning from,

http://msdn2.microsoft.com/en-us/library/2e08f6yc(VS.80).aspx

two simple questions,

1. For every degelate we defined (just a normal C# delegate, no special, and not special designed for asynchronous method call purpose), BeginInvoke and EndInvoke will be defined automatically for every delegate, right? (just looks like for every class we defined, toString, GetHashCode, etc. are defined automatically?)

2. What are the pros and cons compared with the pattern of using EndInvoke to wait for result and the pattern of using WaitHandle to wait for result. To my points, I think they function the same -- block the execution of current thread/method.

thanks in advance,
George