I want to draw lines based on conditions in a chart.

[COUNTEC]

I've been thinking about it for a few days and couldn't find a solution, so I'm asking for help.

This chart displays product weight values.

In this chart, I want to draw a line according to the change condition of the maximum and minimum criteria.

In this chart, there is no problem in drawing lines without changing based on the minimum and maximum settings.

However, if the min and max values are changed in the middle, I want to draw a new line based on that criteria.

            foreach (DataRow row in dataTable.Rows)
            {
                lineSeries4.DataPoints.Add(new CategoricalDataPoint(double.Parse(row["PRODUCT WEIGHT"].ToString()), row["REC.TIME"].ToString()));
            }

            radChartView.Series.Add(lineSeries4);

            // x축 라벨
            CategoricalAxis categoricalAxis = radChartView.Axes[0] as CategoricalAxis;
            categoricalAxis.LabelInterval = dataTable.Rows.Count / 5;

            // y축 라벨
            LinearAxis verticalAxis = radChartView.Axes[1] as LinearAxis;
            verticalAxis.MajorStep = 0.200;
            verticalAxis.Maximum = double.Parse(sValue[2]) + 0.1;
            verticalAxis.Minimum = double.Parse(sValue[1]) - 0.5;
            //verticalAxis.LabelInterval = 2;
            verticalAxis.LabelFormat = "{0:F3}";

            // 눈금 표현
            CartesianArea area = radChartView.GetArea<CartesianArea>();
            area.ShowGrid = true;
            CartesianGrid grid = area.GetGrid<CartesianGrid>();
            grid.DrawHorizontalFills = true;
            grid.BorderDashStyle = System.Drawing.Drawing2D.DashStyle.Solid;

            // max
            CartesianGridLineAnnotation annotation1 = new CartesianGridLineAnnotation();
            annotation1.Axis = radChartView.Axes[1] as CartesianAxis;
            annotation1.Value = double.Parse(sValue[2]);
            annotation1.BorderColor = Color.Red;
            annotation1.BorderDashStyle = DashStyle.Solid;
            annotation1.BorderWidth = 1;
            annotation1.Label = sValue[2];
            radChartView.Annotations.Add(annotation1);

            // average
            CartesianGridLineAnnotation annotation2 = new CartesianGridLineAnnotation();
            annotation2.Axis = radChartView.Axes[1] as CartesianAxis;
            annotation2.Value = double.Parse(sValue[0]);
            annotation2.BorderColor = Color.Blue;
            annotation2.BorderDashStyle = DashStyle.Solid;
            annotation2.BorderWidth = 1;
            annotation2.Label = sValue[0];
            radChartView.Annotations.Add(annotation2);

            // min
            CartesianGridLineAnnotation annotation3 = new CartesianGridLineAnnotation();
            annotation3.Axis = radChartView.Axes[1] as CartesianAxis;
            annotation3.Value = double.Parse(sValue[1]);
            annotation3.BorderColor = Color.Green;
            annotation3.BorderDashStyle = DashStyle.Solid;
            annotation3.BorderWidth = 1;
            annotation3.Label = sValue[1];
            radChartView.Annotations.Add(annotation3);

[Dess | Tech Support Engineer, Principal]

Hello, 

According to the provided screenshot and information, I suppose that the SteplineSeries would be a perfect fit for your case. The following help article demonstrates how to setup a SteplineSeries:
https://docs.telerik.com/devtools/winforms/controls/chartview/series-types/stepline

I hope this information helps. If you need any further assistance please don't hesitate to contact me. 

Regards,
Dess | Tech Support Engineer, Principal
Progress Telerik