ChartAreas[0].AxisY dynamic data

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C#

I have a problem in time to let the dynamic chart.ChartAreas [0]. AxisY the y-axis to get the maximum value and minimum value, so you do not cut the spline chart

below is my code:

private string GetSparkLineImage (IEnumerable <float> samples, int width, int height, int id,                SPWeb web // this because im using impersonate user )
        {
            var chart = new Chart ();
            var series = new Series ();
            chart.Series.Add (series);
 / / Sparklines use the 'Spline' chart type to show a smoother trend with a line chart
            series.ChartType = SeriesChartType.Spline;
            / / Since the line is the only thing you see on the chart, you might want to
            / / Increase its width. Interestingly, you need to set the BorderWidth property
            / / In order to ACCOMPLISH that.
            series.BorderWidth = 2;
            / / Add samples to the series
            int i = 0;
            DateTime start = new DateTime (2010, 1, 1);
            foreach (var sample in samples)
            {
                i + +;
               
                / / Add 5 to the sample so line does not get cut off at the bottom of the image

                Chart.Series [0]. Points.AddXY (start.AddYears (i) sample);
                / / Chart.Series [0]. Points.AddXY (i, sample);
            }


            / / Start hiding Both sets of axes, labels, gridlines and tick marks
            var = new ChartArea ChartArea ();
            chart.ChartAreas.Add (ChartArea);
            chartArea.AxisX.LabelStyle.Enabled = false;
            chartArea.AxisY.LabelStyle.Enabled = false;
            chartArea.AxisX.MajorGrid.Enabled = false;
            chartArea.AxisY.MajorGrid.Enabled = false;
            chartArea.AxisX.MajorTickMark.Enabled = false;
            chartArea.AxisY.MajorTickMark.Enabled = false;
            chartArea.AxisX.LineWidth = 0;
            chartArea.AxisY.LineWidth = 0;

            / / Code Pilot
            chart.ChartAreas [0]. AxisX.Minimum = 0;
            chart.ChartAreas [0]. AxisX.Maximum = 20;

            Chart.Series [0]. IsXValueIndexed = true;
            Chart.Series [0]. YValuesPerPoint = 4;

           

            min = int (int) chart.ChartAreas [0]. AxisX.Minimum;
            int max = (int) chart.ChartAreas [0]. AxisX.Maximum;

            if (max> Chart.Series [0]. Points.Count)
                Chart.Series = max [0]. Points.Count;

        

            var points Chart.Series = [0]. Points.Skip (min). Take (max - min);

            var minValue = points.Min (x => x.YValues ​​[0]);
            var maxValue = points.Max (x => x.YValues ​​[0] * 2);



            chart.ChartAreas [0]. AxisY.Minimum = minValue;
            chart.ChartAreas [0]. AxisY.Maximum = maxValue;


            / / End Code Pilot
            / / Add an extra 5 pixels since the samples were adjusted up by 5
            / / This Prevents the line from being truncated

            / / ChartArea.AxisY.Maximum maxValue = + 900;
            / / = ChartArea.AxisY.Minimum minValue - 100;

            / / Re-adjust the size of the chart to reduce unnecessary white space
            chart.Width = width;
            chart.Height = height;

            / / Get bytes of PNG image
            var s = new MemoryStream ();
            chart.SaveImage (s, ChartImageFormat.Png);
            s.Position = 0;

            Web.Lists SPList list = ["MyLibrary"];
            SPFolder folder = list.RootFolder;
            web.AllowUnsafeUpdates = true;
            byte [] picFile s.ToArray = ();
            var fname = folder.Files.Add ("img" + id + ". png", picFile, true);

            s.Position = 0;
            arq.Url return;

          }