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I've got a .Net 3.5 C# Winforms app. It's got no GUI as such, just a NotifyIcon with a ContextMenu. I've tried to set the NotifyIcon to visible=false and dispose of it in the Application_Exit event, as follows: if (notifyIcon != null) { notifyIcon.Visible = false; notifyIcon.Dispose(); } The app gets to the code inside the brackets, but throws a null ref exception when it tries to set Visible = false. I've read in a few places to put it in the form closing event, but that code never gets hit (maybe as I don't have a form showing as such?). Where can I put this code so it actually works? If I don't put it in, I get the annoying lingering icon in the tray until you move the mouse over it. Cheers. EDIT Just something extra I've noticed........... I'm using ClickOnce in the app.........if I just exit the app via the ContextMenu on the NotifyIcon, no exception is logged. Just when the Application_Exit event is fired after the applicaiton has checked for an upgrade here.. private void CheckForUpdate() { EventLogger.Instance.LogEvent("Checking for Update"); if (ApplicationDeployment.IsNetworkDeployed && ApplicationDeployment.CurrentDeployment.CheckForUpdate()) { EventLogger.Instance.LogEvent("Update available - updating"); ApplicationDeployment.CurrentDeployment.Update(); Application.Restart(); } } Does this help?

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