static void Main()
 {
    int frequency = 0, increment = 0;
    BrainPad.Display.Clear();
    BrainPad.Display.DrawSmallText(0, 0, "Frequence = " + frequency);
    BrainPad.Display.RefreshScreen();

    while (true)
    {
        if (BrainPad.Buttons.IsUpPressed())
         {
            increment = 100;
         }
        if (BrainPad.Buttons.IsDownPressed())
         {
            increment = -100;
         }
        if (increment != 0)
         {
            frequency = frequency + increment;
            BrainPad.Display.Clear();
            BrainPad.Display.DrawSmallText(0, 0, "Frequence = " + frequency);
            BrainPad.Display.RefreshScreen();
            increment = 0;
            BrainPad.Buzzer.StartBuzzing(frequency);
            BrainPad.Wait.Seconds(0.2);
            BrainPad.Buzzer.StopBuzzing();
         }
    }
}