public string GetEchoString(string value)
        {
            string result = "";
            var    code   = new WXBizMsgCrypt(Token, EncodingAesKey, AppId).VerifyURL(MsgSignature, TimeStamp, Nonce, value, ref result);

            if (code == 0)
            {
                return(result);
            }
            return(null);
        }
        public string Encrypt(string value)
        {
            string result = "";
            var    code   = new WXBizMsgCrypt(Token, EncodingAesKey, AppId).EncryptMsg(value, TimeStamp, Nonce, ref result);

            if (code == 0)
            {
                return(result);
            }
            return(null);
        }