Tray application allow system to kill my program when logouting or exiting

Question

My program is starting with windows, I have such code to prevent exiting application when user hits exit button:

    protected override void OnClosing(CancelEventArgs e)
    {
        this.ShowInTaskbar = false;
        e.Cancel = true;
        this.Hide();
    }

It is working very well, but when I want to turn off computer, every time I get screen like 'One or more application cannot be exited. Cancel - Exit despite this.

How can I allow windows to normally exit my application, but also prevent user from exiting it when click red exit button?

Answer 1

See How to detect Windows shutdown or logoff.

In the SessionEnded event handler, set a boolean like sessionEnded and in your OnClosing test for that value:

if (!sessionEnded)
{
    e.Cancel = true;
    this.Hide();
}