Stream CreateChart(IEnumerable <Sales_by_Category> sales)
{
var cc = new WebChartControl();
cc.Width = Unit.Pixel(600);
cc.Height = Unit.Pixel(400);
cc.Legend.Visibility = DevExpress.Utils.DefaultBoolean.False;
var series = new DevExpress.XtraCharts.Series("Products", DevExpress.XtraCharts.ViewType.Bar);
series.DataSource = sales;
series.ArgumentDataMember = "ProductName";
series.ValueScaleType = DevExpress.XtraCharts.ScaleType.Numerical;
series.ValueDataMembers.AddRange(new string[] { "ProductSales" });
cc.Series.Add(series);
Controls.Add(cc);
cc.DataBind();
MemoryStream stream = new MemoryStream();
cc.ExportToImage(stream, System.Drawing.Imaging.ImageFormat.Png);
stream.Position = 0;
return(stream);
}
