How to make a call to my WCF service asynchronous?
Solution 1:
All your needs will be satisfied in the following articles from MSDN:
Implementing an Async Service Operation
Calling WCF Service Async
Designing Service Contracts
Solution 2:
On Visual Studio 2010, on the Add Service Reference > click Advanced button > check the Generate Asynchronous Operations checkbox.
After doing so, the Async operations will be added and be available for your use.