c# exit program

Application.Exit();

if (System.Windows.Forms.Application.MessageLoop) 
{
    // WinForms app
    System.Windows.Forms.Application.Exit();
}
else
{
    // Console app
    System.Environment.Exit(1);
}

System.Environment.Exit(1);

 Application.Exit();

// In a console application:
Environment.Exit(0);
// In a WPF application:
Close();

private void Test(int condition)
{
  if(condition)
    return; // Exit the methode

  // Here code if condition == false
}

System.Windows.Forms.Application.ExitThread( )