Where can I find a good Silverlight 4 WCF duplex tutorial? [closed]

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I'm interested in seeing a good example of a duplex service that a Silverlight 4 application connects to, is there one out there? I'm willing to get a book if it's located in it.

I went though the MSDN one located here and didn't follow it very well, or even get it working.

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2 best examples I've found:

http://www.42spikes.com/post/Using-Silverlight-4-and-NetTCP-Duplex-Callbacks.aspx

http://tomasz.janczuk.org/2009/11/pubsub-sample-with-wcf-nettcp-protocol.html

some good info -- http://tomasz.janczuk.org/2009/11/wcf-nettcp-protocol-in-silverlight-4.html

Hope that helps --

Chad