public IActionResult GetImagePaid()
{
ChartProviderPaid cp = new ChartProviderPaid();
IChart chart = cp.GetChart();
chart.Title = "Hours per day";
List <string> xdata = new List <string>();
xdata.Add("Mon");
xdata.Add("Tue");
xdata.Add("Wed");
xdata.Add("Thu");
xdata.Add("Fri");
xdata.Add("Sat");
xdata.Add("Sun");
List <int> ydata = new List <int>();
ydata.Add(12);
ydata.Add(7);
ydata.Add(4);
ydata.Add(10);
ydata.Add(3);
ydata.Add(11);
ydata.Add(5);
chart.XData = xdata;
chart.YData = ydata;
Bitmap bmp = chart.GenerateChart();
MemoryStream stream = new MemoryStream();
bmp.Save(stream, ImageFormat.Png);
byte[] data = stream.ToArray();
stream.Close();
return(File(data, "image/png"));
}