Zxing: generate QR code

var code = "Hello, QRCode";
var hints = new Dictionary();
hints.Add(EncodeHintType.CHARACTER_SET, "UTF-8");
hints.Add(EncodeHintType.MARGIN, 2);

var qrWriter = new QRCodeWriter();
var result = qrWriter.encode(code, BarcodeFormat.QR_CODE, 200, 200, hints);

var writer = new BarcodeWriter() { Format = BarcodeFormat.QR_CODE };
var bitmap = writer.Write(result);

var ms = new System.IO.MemoryStream();
var img = System.Drawing.Image.FromHbitmap(bitmap.GetHbitmap());
img.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
ms.Close();

System.IO.File.WriteAllBytes("qrcode.png", ms.ToArray());