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if (watch.ElapsedMilliseconds > 1000)
{
    if(!backgroundWorker1.IsBusy) backgroundWorker1.RunWorkerAsync(); 
               
    watch.Reset();
    watch.Start();               
}                    

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[cs]C# Code hier rein.
Geht auch über mehrere Zeilen.[/cs]                    

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    public void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            backgroundWorker1.WorkerReportsProgress = true;
            backgroundWorker1.ReportProgress(1);
         }
        private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        { 
            
            if (this.fastLineSeries1.Count > Convert.ToInt32(AnzeigeWerte) ) this.fastLineSeries1.Delete(0, this.fastLineSeries1.Count - Convert.ToInt32(AnzeigeWerte));
            if (this.fastLineSeries2.Count > Convert.ToInt32(AnzeigeWerte) ) this.fastLineSeries2.Delete(0, this.fastLineSeries2.Count - Convert.ToInt32(AnzeigeWerte));
            if (this.fastLineSeries3.Count > Convert.ToInt32(AnzeigeWerte) ) this.fastLineSeries3.Delete(0, this.fastLineSeries3.Count - Convert.ToInt32(AnzeigeWerte));
    

            tChart1.AutoRepaint = true;
               fastLineSeries1.Repaint();
               fastLineSeries2.Repaint();
               fastLineSeries3.Repaint();     
            tChart1.AutoRepaint = false;
             
        }                    

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Timer timer;

void Setup()
{
    timer = new Timer { Interval = 1000 };
    timer.Tick += TimerTick;
    timer.Start();
}

void TimerTick(object sender, EventArgs e)
{
        int wert = int.Parse(AnzeigeWerte);
        if (fastLineSeries1.Count > wert) fastLineSeries1.Delete(0, fastLineSeries1.Count - wert);
        if (fastLineSeries2.Count > wert) fastLineSeries2.Delete(0, fastLineSeries2.Count - wert);
        if (fastLineSeries3.Count > wert) fastLineSeries3.Delete(0, fastLineSeries3.Count - wert);
    

        tChart1.AutoRepaint = true;    // Was hat das für einen Sinn? AutoRepaint und dann das Repaint manuell erzwingen??
        fastLineSeries1.Repaint();
        fastLineSeries2.Repaint();
        fastLineSeries3.Repaint();     
        tChart1.AutoRepaint = false;
}