Asynchronous Callback in WCF/Silverlight 4 application Pin

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WCF

Silverlight4

Hello,

When I click on a button at UI side, One method is called at serviceside(named Service1).

From service1, an asynchronous call given to another service(named Service2).

At same time, callback is returned to UI from Service1.

But I want to wait till Service2 return data to Service1 and stored into database.

Let me know how to wait in asynchronous call.

Thanks in advance.

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- Parth Gandhi