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...

Silverlight 3 Beta introduces a new way to improve the performance of web services. You have all probably used the Silverlight-enabled WCF Service item template in Visual Studio to create a WCF web service, and then used the Add Service Reference command in your Silverlight application project in order...