WCF communication with a Silverlight application?

You can add Silverlight enabled WCF services and communicate with them like you did in the WPF app.

Just so you know, SL only supports basicHttpBinding and (new in SL4) netTcpBinding. The later is intended for Intranet scenarios. As tchrikch said, you should be able to reference your service just by adding a simple reference in Visual Studio.

As for the communication part, this may prove to be a little difficult. I would suggest looking at HTML5 WebSockets and see if you can push messages to the client from the server that way. I've only recently started looking at this as a solution for one of our projects but haven't had time to look any deeper.

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