WFA_psychometric_chart.Form1_main.saveAsImageHeatMap C# (CSharp) Method

        public void saveAsImageHeatMap()
        {
            string fileName = "";
            saveFD.InitialDirectory = "C:";
            saveFD.FileName = "ChartImage";
            saveFD.Filter = "PNG(.png) |*.png|Bitmap(.bmp) |*.bmp|JPEG |*.jpeg";
            ImageFormat format = ImageFormat.Png;
            if (saveFD.ShowDialog() == DialogResult.OK)
            {
                fileName = saveFD.FileName;
                string ext = System.IO.Path.GetExtension(saveFD.FileName);
                switch (ext)
                {
                    case ".bmp":
                        format = ImageFormat.Bmp;
                        break;
                    case ".jpeg":
                        format = ImageFormat.Jpeg;
                        break;
                }

               chart1.SaveImage(fileName, format);
            }
            //else
            //{
            //    fileName = "ChartImage.png";
            //    MessageBox.Show(Properties.Resources._Your_chart_image_will_be_save + fileName);
            //}


        }
    }//close of btn4

 private void saveAsImageToolStripMenuItem_Click(object sender, EventArgs e)
 {
     form1.saveAsImageHeatMap();
 }