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copied!<p>Setting SessionMode to SessionMode.Required will enforce using bindings which support sessions, like NetTcpBinding, WSHttpBinding, etc. In fact if you try using a non-session-enabled binding , the runtime will throw an exception when you try to open the host.</p> <p>Setting InstanceContextMode to PerSession means that only one instance of the service will be crated per session and that instance will serve all the requests coming from that session.</p> <p>Having SessionId set by the runtime means that you might have a transport session or a reliable session or security session. Having those does not necessarily mean you have an application session , that is a single service object serving the requests per proxy. In other words, you might switch off application session by setting InstanceContextMode=PerCall forcing the creation of a new service object for every call, while maintaining a transport session due to using netTcpBinding, or a reliable or security session.</p> <p>Think of the application session that is configured by InstanceContextMode and Session Mode as a higher level session, relying on a lower-level session /security, transport or reliable/. An application session cannot actually be established without having one of the other sessions in place, from there the requirement for the binding .</p> <p>It is getting a bit long already, but for simple values I would recommend you to pass those values every time instead of creating application session. That will ensure the service objects have a short lifetime and no unnecessary resources will be kept alive on the server. It makes a lot sense with more clients, or proxies talking to your service. And you could always cache the values in the clients, even pass them as custom headers if you want.</p>

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