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What is an async method call and why might you use it?
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Async means that the call will return immediately (it will not block). Depending on implementation you can (but you don't have to) receive a callback once the call is done.

It's useful for example when you send a log message to a logging thread or web service method and you don't care about results
 
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Google broken where you live ?

Asych means that the calling code makes the call, then keeps working. Synchronous means it makes the call and waits for a reply.
 
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