C# chart 保存為圖片

 public void ExportChart(string fileName, Chart chart1)
        { 
           string  GR_Path =@"D:";
            string fullFileName = GR_Path + "\\" + fileName + ".png";
            chart1.SaveImage(fullFileName, System.Windows.Forms.DataVisualization.Charting.ChartImageFormat.Png);
        }