Model.Graphics C# (CSharp) 메소드

    public abstract System.Drawing.Bitmap Graphics();

 private void cmdSaveImage_Click(object sender, EventArgs e)
 {
     saveFileDialog.Filter     = "PNG Image (*.png)|*.png";
     saveFileDialog.DefaultExt = "png";
     if (saveFileDialog.ShowDialog() == DialogResult.OK)
     {
         model?.Graphics().Save(saveFileDialog.FileName);
     }
 }