protected void Button1_Click(object sender, EventArgs e)

    {

        QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();

        qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.ALPHA_NUMERIC;//编码方式(ALPHA_NUMERIC：字母和数字,BYTE:为字节,多用于汉字，NUMERIC:数字)

        qrCodeEncoder.QRCodeScale = ;//大小(值越大生成的二维码图片像素越高)

        qrCodeEncoder.QRCodeVersion = ; //版本(注意：设置为0主要是防止编码的字符串太长时发生错误,7)

        qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;//错误效验、错误更正(有4个等级)

        string data = "NI ";//这里是分销商路径

        String ls_fileName = "P"+DateTime.Now.ToString("yyyyMMddhhmmss") +".png";

        String ls_savePath = Server.MapPath(".") + "/QRCodeImages/" + ls_fileName;//

        //System.Text.Encoding.GetEncoding("GB2312")//如果内容是中文需要编码（utf-8，GB2312）

        qrCodeEncoder.Encode(data, System.Text.Encoding.GetEncoding("utf-8")).Save(ls_savePath);

        Image1.ImageUrl=("QRCodeImages/" + ls_fileName);

    }