أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
I don't want to tell the client explicitly that something is changed in my service that he is consuming.
by implementing the IServiceCallback contract in the client application so that the Callback from the WCF service can be received in the client.
the client application behaves as service and service behaves as a client.