public static string linearGradientFillTest()
        {
            int[] line1 = new int[] { 5, 10, 50, 34, 10, 25 };
            LineChart lineChart = new LineChart(250, 150);
            lineChart.SetTitle("Linear Gradient fill test");
            lineChart.SetData(line1);

            lineChart.AddAxis(new ChartAxis(ChartAxisType.Left));
            lineChart.AddAxis(new ChartAxis(ChartAxisType.Bottom));

            LinearGradientFill fill = new LinearGradientFill(ChartFillTarget.ChartArea, 45);
            fill.AddColorOffsetPair("FFFFFF", 0);
            fill.AddColorOffsetPair("76A4FB", 0.75);

            SolidFill bgFill = new SolidFill(ChartFillTarget.Background, "EFEFEF");

            lineChart.AddLinearGradientFill(fill);
            lineChart.AddSolidFill(bgFill);

            return lineChart.GetUrl();
        }
        public static string solidFillTest()
        {
            int[] line1 = new int[] { 5, 10, 50, 34, 10, 25 };
            LineChart lineChart = new LineChart(250, 150);
            lineChart.SetTitle("Solid fill test");
            lineChart.SetData(line1);

            lineChart.AddAxis(new ChartAxis(ChartAxisType.Left));
            lineChart.AddAxis(new ChartAxis(ChartAxisType.Bottom));

            SolidFill bgFill = new SolidFill(ChartFillTarget.Background, "EFEFEF");
            SolidFill chartAreaFill = new SolidFill(ChartFillTarget.ChartArea, "000000");

            lineChart.AddSolidFill(bgFill);
            lineChart.AddSolidFill(chartAreaFill);

            return lineChart.GetUrl();
        }