private static Image GenerateThumbnails() { List <Image> cacheItems = Program.CacheWorker.GetLastNCachedItems(5); var img = RenderImage.HorizontalConcatenate(cacheItems, OneNoteCapture.MaxWidthOneNoteImage); //img.Save(@"c:\data\dump\concat.jpg", System.Drawing.Imaging.ImageFormat.Jpeg); return(img); }