How to notify C# code from Azure database

I am creating a WCF service (CALLER) for Azure. The service(CALLER) calls async methods of another third party service(EXTN). The third party servic开发者_Python百科e calls the callback methods of another WCF service (LISTNER) hosted by me on Azure. CALLER enter the service details in the databsae with status = PENDING.

In the callback service (LISTENER) I am updating the status of the request as COMPLETED/FAILED in the database.

I want to notify my C# code after the value is database changed by LISTENER.

Is it possible????

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how about trying this with Reactive Extensions for .NET (Rx) MS DevLabs