private void AppMainWindow_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
#if DEBUG == false
int connectedClientCount = EngineController.GetConnectedClientCount();
e.Cancel = !((App)Application.Current).IsShutdown &&
(MessageBox.Show(resources._query_ExitApplication, resources._caption_Confirmation, MessageBoxButton.YesNo) != MessageBoxResult.Yes ||
(connectedClientCount > 0 && MessageBox.Show(string.Format(resources._query_ClientsConnectedOnExit, connectedClientCount), resources._caption_Confirmation, MessageBoxButton.YesNo) != MessageBoxResult.Yes));
#endif // DEBUG
}