Convert Transparent PNG to JPG with white Background Color in C#

For example :

            Bitmap bmp = new Bitmap(img.Width, img.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
            using (Graphics g = Graphics.FromImage(bmp))
            {
                g.Clear(Color.White);
                g.DrawImage(img, new Rectangle(new Point(), img.Size), new Rectangle(new Point(), img.Size), GraphicsUnit.Pixel);                    
            }
            bmp.Save(newFilename, System.Drawing.Imaging.ImageFormat.Jpeg);