QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();

                qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE; //  support different mode

                qrCodeEncoder.QRCodeScale = 4;
                qrCodeEncoder.QRCodeVersion = 0;

                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M; // support different mode

                string qrCodeContent = "姓名：粒粒";

                Bitmap img = qrCodeEncoder.Encode(qrCodeContent);
                String newFileName = DateTime.Now.ToString("yyyyMMddHHmmss_ffff", System.Globalization.DateTimeFormatInfo.InvariantInfo);
                string filePath = SettingConfig.ImgUrl + newFileName + ".png";// support different image format

                img.Save(filePath);