How to detect Windows shutdown or logoff

Question

I need to detect when Windows is shutdown (or restarted) or when the user is logging off. I need to properly close the application before the application is closed. I noticed that no exit application event is raised when Windows is closing day.

I read the post Is there a way in c# to detect a Windows shutdown/logoff and cancel that action (after asking the user)

but I'm not sure of where I should perform the operations before closing. Thanks.

user_14945322 · Answer

Now you should use something like this:

private static int WM_QUERYENDSESSION = 0x11;
protected override void WndProc(ref System.Windows.Forms.Message m)
{
    if (m.Msg==WM_QUERYENDSESSION)
    {
        MessageBox.Show("queryendsession: this is a logoff, shutdown, or reboot");
    }
    
    base.WndProc(ref m);
}

How to detect Windows shutdown or logoff

3 Answers