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Is it possible to fire event from service to connected clients without request from client? (I know, if I use client request I could use callback)
I store object in the service with some actual state. State of this object can change very often.
First method: I can send request to this service every second, but I suppose they are better ways.
I thought about event called by wcfservice itself – possible?
Well there are callback available in WCF, I guess that what you are asking for.
http://msdn.microsoft.com/en-us/magazine/cc163537.aspx