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static void Main(string[] args)
{
    Mutex mutex = null;
    bool createdNew;

    try
    {
        mutex = new Mutex(true, AppDomain.CurrentDomain.FriendlyName, out createdNew);
    }
    catch (Exception ex)
    {
        // Handle mutex initialization errors
        MessageBox.Show($"Mutex initialization failed: {ex.Message}");
        return;
    }

    if (!createdNew)
    {
        // Another instance is running
        MessageBox.Show("Another instance is already running.  Exiting.");
        return; // Explicitly exit
    }
    else
    {
        // This is the first instance
        // Application logic goes here...
        // ...ensure mutex is released on exit (see below)
    }

    // Ensure the mutex is released even if the application crashes
    AppDomain.CurrentDomain.ProcessExit += (sender, eventArgs) => { mutex?.ReleaseMutex(); };
}

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