C#

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void PlotChart()
        {
            try
            {
                // Clear existing series
                chart1.Series.Clear();

                // Create new series
                Series First = new Series("Series11");
                Series Second = new Series("Series12");

                // Set chart type
                First.ChartType = SeriesChartType.Spline;
                Second.ChartType = SeriesChartType.Spline;

                // Set custom colors for each series
                First.Color = Color.Blue; // Set the color for First series
                Second.Color = Color.Orange; // Set the color for Second series


                // Connect to the database and retrieve data
                using (SqlConnection connection = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\Database1.mdf;Integrated Security=True"))
                {
                    if(connection.State == ConnectionState.Closed)
                    {
                        connection.Open();
                    }
                    

                    // Select only rows where RawDataOrder is equal to label86 text
                    string query = $"SELECT * FROM Data WHERE RawDataOrder = {Convert.ToInt32(label86.Text.Trim())}";
                    using (SqlCommand command = new SqlCommand(query, connection))
                    {
                        using (SqlDataReader reader = command.ExecuteReader())
                        {
                            while (reader.Read())
                            {
                                // Assuming the first column is 'ID', the second is '11', and the third is '12'
                                int id = reader.GetInt32(0);
                                int value11 = reader.GetInt32(1);
                                int value12 = reader.GetInt32(8);

                                // Add data points to the series
                                First.Points.AddXY(id, value11);
                                Second.Points.AddXY(id, value12);
                            }
                        }
                    }
                }

                // Add the series to the chart
                chart1.Series.Add(First);
                chart1.Series.Add(Second);

                // Set chart title
                chart1.Titles.Clear();
                chart1.Titles.Add(new Title("Channel 1"));

                // Refresh the chart to update the display
                chart1.Update();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error PlotChart", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

private decimal Lowest(int bar, ValueDataSeries src, int length)
        {
            if (bar < length)
                return (0.0m);
            decimal res = decimal.MaxValue;

            for (int index = bar; index >= bar - (length - 1); index--)
            {
                if (src[index] < res)
                    res = src[index];
            }

            return (res);
        }