Smartasses

public class SingleInstanceManager
      : WindowsFormsApplicationBase
{
 
    public SingleInstanceManager()
    {
        IsSingleInstance = true;
        EnableVisualStyles = true;
        ShutdownStyle = ShutdownMode.AfterMainFormCloses;
    }
 
    protected override bool OnStartup(StartupEventArgs e)
    {
        return true;
    }
 
    protected override void OnCreateMainForm()
    {
        base.OnCreateMainForm();
        MainForm = new MainForm();
        HideSplashScreen();
    }
 
    protected override void OnStartupNextInstance(StartupNextInstanceEventArgs eventArgs)
    {
        base.OnStartupNextInstance(eventArgs);
        MainForm.Focus();
    }
 
    protected override void OnCreateSplashScreen()
    {
        base.OnCreateSplashScreen();
        SplashScreen = new SplashForm();
    }
}

[STAThread]
static void Main()
{
    var manager = new SingleInstanceManager();
    manager.Run(new string[]{});
}

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