Have you tried to implement this event as the example of microsoft ? like that
Important: Console applications do not raise the SessionEnding event.
This event is only raised if the message pump is running. In a Windows service, unless a hidden form is used or the message pump has been started manually, this event will not be raised. For a code example that shows how to handle system events by using a hidden form in a Windows service, see the SystemEvents class. -> Message pump in .NET Windows service
private static int WM_QUERYENDSESSION = 0x11;
private static bool systemShutdown = false;
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");
systemShutdown = true;
}
// If this is WM_QUERYENDSESSION, the closing event should be
// raised in the base WndProc.
base.WndProc(ref m);
} //WndProc
private void Form1_Closing(
System.Object sender,
System.ComponentModel.CancelEventArgs e)
{
if (systemShutdown)
// Reset the variable because the user might cancel the
// shutdown.
{
systemShutdown = false;
if (DialogResult.Yes==MessageBox.Show("My application",
"Do you want to save your work before logging off?",
MessageBoxButtons.YesNo))
{
e.Cancel = true;
}
else
{
e.Cancel = false;
}
}
}
More info ? See here :
SystemEvents.SessionEnding Event
