One of the new features in the WCF stack in Silverlight 4 is an improvement of our PollingDuplex binding, which allows duplex communication over HTTP. HTTP is a request/reply communication medium, so some tricks are needed to make it look like a duplex transport, where both the client and the server can send messages to each other.
Check out our MSDN tutorial for a walkthrough on how to build a service using PollingDuplex in Silverlight 4 using Visual Studio 2010. If you prefer a video, check out this episode of Silverlight TV, where our dev lead Tomasz demonstrates the feature (you can ignore the net.tcp part).
Silverlight 4 adds a new mode to the existing PollingDuplex binding, which enables significantly higher throughput in low-latency scenarios. The throughput in some ...
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