1) SvcUtil.exe:
You can use the svcutil.exe utility from WCF. The syntax is this:
svcutil.exe /async <url to wsdl-file> (this is the most basic form! More advanced versions exists)
2) VS service reference Visual Studio does actually support this behavior if you are a bit careful when generating the proxy. If you check this box, you do get methods named Begin<method>/End<method>.

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