自己参考QrCode.Net开源实例封装了一个生成二维码的静态方法如下：

/// <summary>
    /// 含有QR码的描述类和包装编码和渲染
    /// </summary>
    public class QRCodeHelper
    {
        /// <summary>
        /// 获取二维码
        /// </summary>
        /// <param name="strContent">待编码的字符</param>
        /// <param name="ms">输出流</param>
        ///<returns>True if the encoding succeeded, false if the content is empty or too large to fit in a QR code</returns>
        public static bool GetQRCode(string strContent, MemoryStream ms)
        {
            ErrorCorrectionLevel Ecl = ErrorCorrectionLevel.M; //误差校正水平 
            string Content = strContent;//待编码内容
            QuietZoneModules QuietZones = QuietZoneModules.Two;  //空白区域 
            int ModuleSize = 12;//大小
            var encoder = new QrEncoder(Ecl);
            QrCode qr;
            if (encoder.TryEncode(Content, out qr))//对内容进行编码，并保存生成的矩阵
            {
                var render = new GraphicsRenderer(new FixedModuleSize(ModuleSize, QuietZones));
                render.WriteToStream(qr.Matrix, ImageFormat.Png, ms);
            }
            else
            {
                return false;
            } 
            return true;
        } 

    }

vs2010  framework3.5  引用的组件是QrCode.Net 0.4 Pre-Release\Gma.QrCodeNet.Encoding.Net35 

  public ActionResult Index()
        {
             
            // Render the QR code as an image
            using (var ms = new MemoryStream())
            {
                string stringtest="中国inghttp://www.baidu.com/mvc.test?&";
                QRCodeHelper.GetQRCode(stringtest, ms);
                Response.ContentType = "image/Png";
                Response.OutputStream.Write(ms.GetBuffer(), 0, (int)ms.Length); 
                Response.End();
            }
             
            return View();
        }