Save system.drawing.image as PNG without interlace and transparency in .NET

using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Windows.Media.Imaging;

namespace plng
{
    class Program
    {
        static void Main(string[] args)
        {
            Image img = Bitmap.FromFile("foo.bmp");

            using (MemoryStream ms = new MemoryStream())
            {
                img.Save(ms, ImageFormat.Bmp);
                ms.Seek(0, SeekOrigin.Begin);

                PngBitmapEncoder enc = new PngBitmapEncoder();
                enc.Interlace = PngInterlaceOption.Off;
                enc.Frames.Add(BitmapFrame.Create(ms));

                using (FileStream ostream = new FileStream("bar.png", FileMode.Create))
                {
                    enc.Save(ostream);
                }
            }

        }
    }
}