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    <p>Since you are on a service, you can get session change events directly. </p> <p>You can register yourself to receive the <code>SERVICE_CONTROL_SESSIONCHANGE</code> event. In particular, you will want to look for the <code>WTS_SESSION_LOGON</code> and <code>WTS_SESSION_LOGOFF</code> reasons. </p> <p>For details and links to the relevant MSDN docs, check <a href="https://stackoverflow.com/a/16444110/863564">this answer I wrote just yesterday</a>.</p> <p>In C# it is even easier, as ServiceBase already wraps the service control routine and exposes the event as an overridable <code>OnSessionChange</code> method for you. See <a href="http://msdn.microsoft.com/en-us/library/system.serviceprocess.servicebase.onsessionchange.aspx" rel="nofollow noreferrer">MSDN docs for ServiceBase</a>, and do not forget to set the <code>CanHandleSessionChangeEvent</code> property to true to enable the execution of this method.</p> <p>What you get back when the framework calls your <code>OnSessionChange</code> override is a <a href="http://msdn.microsoft.com/en-us/library/system.serviceprocess.sessionchangedescription.aspx" rel="nofollow noreferrer">SessionChangeDescription Structure</a> with a reason (logoff, logon, ...) and a session ID you can use to obtain information, for example, on the user logging on/off (see the link to my prev answer for details)</p> <p>EDIT: sample code</p> <pre><code> public class SimpleService : ServiceBase { ... public SimpleService() { CanPauseAndContinue = true; CanHandleSessionChangeEvent = true; ServiceName = "SimpleService"; } protected override void OnSessionChange(SessionChangeDescription changeDescription) { EventLog.WriteEntry("SimpleService.OnSessionChange", DateTime.Now.ToLongTimeString() + " - Session change notice received: " + changeDescription.Reason.ToString() + " Session ID: " + changeDescription.SessionId.ToString()); switch (changeDescription.Reason) { case SessionChangeReason.SessionLogon: EventLog.WriteEntry("SimpleService.OnSessionChange: Logon"); break; case SessionChangeReason.SessionLogoff: EventLog.WriteEntry("SimpleService.OnSessionChange Logoff"); break; ... } </code></pre>
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    1. POGet notified from logon and logoff
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    1. USLorenzo Dematté
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    1. COThis is about WTSRegisterSessionNotification? Which window handler should I use? Or does I misunderstood your description?
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      1. UShofmeister
    2. CO@hofmeister, no you do not need WTSRegisterSessionNotification if you are in a service: Services already receive session notifications posted to their service control routine. Since you are using C#, I suppose you are implementing your service by deriving ServiceBase. Am I right?
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    3. COYes I do, in short form. While I deriving from `ServiceBase` class, I could just override the `OnSessionChange` method?
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