CallBack in WCF?

How we use CallBack in WCF fluently with events and delegates?

If Client give any request or any conditions matches of client then services automatica开发者_开发知识库lly fire the event which condition or request given from client.

how is it possible?

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A cleaner model is an event driven one using a Publish/Subscribe Pattern. Read this to get inside onto both methods.

http://msdn.microsoft.com/en-us/magazine/cc163537.aspx

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You basically define a service method as one-way and also create a message callback. See more here: http://idunno.org/archive/2008/05/29/wcf-callbacks-a-beginners-guide.aspx