visual studio – Building a stock ticker on candlestick chart and want to add line annotation from valley to peak. How can I do that in C# where is dynamically changes

code

 private void AddLineAnnotation(ComboBox comboBox, List<Tuple<DateTime, DateTime>> waveList, bool isUpWave)
    {
        if (comboBox.SelectedItem == null) return;

        int selectedIndex = comboBox.SelectedIndex;
        if (selectedIndex < 0 || selectedIndex >= waveList.Count) return;

        var selectedWave = waveList[selectedIndex];
        var startCandlestick = candlestickList.FirstOrDefault(c => c.Date.Date == selectedWave.Item1.Date);
        var endCandlestick = candlestickList.FirstOrDefault(c => c.Date.Date == selectedWave.Item2.Date);

        if (startCandlestick != null && endCandlestick != null)
        {
            double startY = isUpWave ? startCandlestick.Low : startCandlestick.High;
            double endY = isUpWave ? endCandlestick.High : endCandlestick.Low;

            // Create line annotation
            var lineAnnotation = new LineAnnotation
            {
                AxisX = chart1.ChartAreas[0].AxisX,
                AxisY = chart1.ChartAreas[0].AxisY,
                X = startCandlestick.Date.ToOADate(),
                Y = startY,
                Width = endCandlestick.Date.ToOADate() - startCandlestick.Date.ToOADate(),
                Height = endY - startY,
                LineColor = isUpWave ? Color.Green : Color.Red,
                LineWidth = 2,
                LineDashStyle = ChartDashStyle.Solid,
                IsSizeAlwaysRelative = false,
                ClipToChartArea = chart1.ChartAreas[0].Name,
                Tag = "WaveLine" // add that if x and y are not numbers then use anchor x and anchor y, and it should be set to NAN
            };

            // Add the line annotation to the chart
            chart1.Annotations.Add(lineAnnotation);

            // Refresh the chart
            chart1.Invalidate();
        }
    } // this code is not working, help please