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private void button1_Click(object sender, EventArgs e)
        {
            Graphics Grafik;
            float hoehe = 0;
            float strecke = 0;
            float zeit = 0;
            Stopwatch stopWatch = new Stopwatch();
            TimeSpan timeSpan;
            Grafik = this.CreateGraphics();
            //Ausgangsposition
            Grafik.FillEllipse(Brushes.Lime, 100, 0, 50, 50);

            stopWatch.Start();
            Thread.Sleep(100);
            //Solange er nicht am unteren Rand vom Fenster ist
            while (hoehe < 500)
            {
                stopWatch.Stop();
                timeSpan = stopWatch.Elapsed;
                zeit = timeSpan.Milliseconds;

                //v = 20 Pixel pro Sekunde
                strecke = 20 * (zeit / 1000);
                hoehe = hoehe + strecke;
                Refresh();
                Grafik.FillEllipse(Brushes.Lime, 100, hoehe, 50, 50);
                stopWatch.Start();
                //Warten
                Thread.Sleep(100);
            }
        }