How to put image logo within generated qr code

namespace CodeCreator
{
    public partial class _default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
        }

        protected void CreateCode_OnClick(object sender, EventArgs e)
        {
            string path = "c:\\code\\projects\\CodeCreator\\CodeCreator\\";
            QRCodeEncoder encoder = new QRCodeEncoder();

            encoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H; // 30%
            encoder.QRCodeScale = 10;

            Bitmap img = encoder.Encode(URL.Text);
            LogoUpload.SaveAs(path + LogoUpload.FileName);

            System.Drawing.Image logo = System.Drawing.Image.FromFile(path + LogoUpload.FileName);

            int left = (img.Width / 2) - (logo.Width / 2);
            int top = (img.Height / 2) - (logo.Height / 2);

            Graphics g = Graphics.FromImage(img);

            g.DrawImage(logo, new Point(left, top));

            img.Save(path + "img.jpg", ImageFormat.Jpeg);

            QRImage.ImageUrl = "img.jpg";
        }
    }
}