QrCodeEncodingOptions options = new QrCodeEncodingOptions();
options.CharacterSet = "UTF-8";
options.DisableECI = true; // Extended Channel Interpretation (ECI) 主要用于特殊的字符集。并不是所有的扫描器都支持这种编码。
options.ErrorCorrection = ZXing.QrCode.Internal.ErrorCorrectionLevel.H; // 纠错级别
options.Width = 300;
options.Height = 300;
options.Margin = 1;
// options.Hints，更多属性，也可以在这里添加。

BarcodeWriter writer = new BarcodeWriter();
writer.Format = BarcodeFormat.QR_CODE;
writer.Options = options;

Response.Clear();
using (Bitmap bmp = writer.Write("http://www.cftea.com")) // Write 具备生成、写入两个功能
{
 MemoryStream ms = new MemoryStream();
 {
  bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Png);

  Response.ContentType = "image/png";
  Response.BinaryWrite(ms.ToArray());
 }
}
Response.End();

QrCodeEncodingOptions options = new QrCodeEncodingOptions();
options.CharacterSet = "UTF-8";
options.Width = 300;
options.Height = 50;
options.Margin = 1;
options.PureBarcode = false; // 是否是纯码，如果为 false，则会在图片下方显示数字

BarcodeWriter writer = new BarcodeWriter();
writer.Format = BarcodeFormat.CODE_128;
writer.Options = options;

Response.Clear();
using (Bitmap bmp = writer.Write("12345678"))
{
 MemoryStream ms = new MemoryStream();
 {
  bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Png);

  Response.ContentType = "image/png";
  Response.BinaryWrite(ms.ToArray());
 }
}
Response.End();

BarcodeReader reader = new BarcodeReader();
reader.Options.CharacterSet = "UTF-8";
using (Bitmap bmp = new Bitmap("D:\\qr.png"))
{
 Result result = reader.Decode(bmp);
 Response.Write(result.Text);
}