How to generate Begin/End invocation pattern methods in web service proxies in VS 8+

It is a problem asked by some customers.  They were using Begin/End invocation pattern to call web service asynchronously.  Those async methods were generated in web proxies in Visual Studio 7.x, and when they are using wsdl.exe tool, but were gone when they use the Visual Studio 2005 or Orcas Beta 2.  In both VS…

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