//Controllo presenza Cartella Grafici
                if (!Directory.Exists("Charts"))
                    Directory.CreateDirectory("Charts");
                //Salvataggio chIstogramma
                 Brush wOldColor = pnlLegenda.Background;
                Rect rettangolo = new Rect(pnlGrafico.RenderSize);
                RenderTargetBitmap rtb = new RenderTargetBitmap((int)rettangolo.Right, (int)rettangolo.Bottom, 96d, 96d, PixelFormats.Default);
                pnlLegenda.Background = new SolidColorBrush(Colors.Transparent);
                rtb.Render(pnlGrafico);
                BitmapEncoder jpgEncoder = new JpegBitmapEncoder();
                jpgEncoder.Frames.Add(BitmapFrame.Create(rtb));
                MemoryStream ms = new MemoryStream();
                jpgEncoder.Save(ms);
                ms.Close();
                File.WriteAllBytes(modificaNome("imgIstogramma", "Charts/", ".jpg"), ms.ToArray());
                pnlLegenda.Background = wOldColor;