private void CreateQrcode(string nr)    {      Bitmap bt;      string enCodeString = nr;      QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();      bt = qrCodeEncoder.Encode(enCodeString, Encoding.UTF8);      string filename = DateTime.Now.ToString("yyyymmddhhmmss");      string path = Server.MapPath("~/image/") + filename + ".jpg";      Response.Write(path);      bt.Save(path);      this.Image1.ImageUrl = "~/image/" + filename + ".jpg";    }

protected void Button1_Click(object sender, EventArgs e)    {      using (var ms = new MemoryStream())      {        string stringtest = "中國inghttp://www.baidu.com/mvc.test?&";        GetQRCode(stringtest, ms);        Response.ContentType = "image/Png";        Response.OutputStream.Write(ms.GetBuffer(), 0, (int)ms.Length);        Image img = Image.FromStream(ms);        string filename = DateTime.Now.ToString("yyyymmddhhmmss");        string path = Server.MapPath("~/image/") + filename + ".png";        img.Save(path);        Response.End();      }     }

    /// <summary>    /// 獲取二維碼    /// </summary>    /// <param name="strContent">待編碼的字符</param>    /// <param name="ms">輸出流</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; //誤差校正水平       string Content = strContent;//待編碼內容      QuietZoneModules QuietZones = QuietZoneModules.Two; //空白區域       int ModuleSize = 12;//大小      var encoder = new QrEncoder(Ecl);      QrCode qr;      if (encoder.TryEncode(Content, out qr))//對內容進行編碼，并保存生成的矩陣      {        var render = new GraphicsRenderer(new FixedModuleSize(ModuleSize, QuietZones));        render.WriteToStream(qr.Matrix, ImageFormat.Png, ms);      }      else      {        return false;      }      return true;    }