How to: generate a duplex service for the Silverlight Client

How to Create a duplex windows Communication Foundation (WCF) service that can communicate with the Silverlight client. The Duplex service will be retained to the callback channel of the Silverlight client, which allows the service to call the client. Duplex services have many applicationsProgramFor example, this includes a chat service program for instant messaging or a monitoring service for sending notifications to clients. The http://msdn.microsoft.com/zh-cn/library/cc645027 (vs.95). aspx

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