static public string FormatString(Stream resp)
        {
            UFileError obj = (UFileError)JsonObject(resp);

            if (obj == null)
            {
                return("");
            }
            return(string.Format("RetCode: {0} ErrMsg: {1}", obj.GetRetCode(), obj.GetErrMsg()));
        }
        static public Object JsonObject(Stream resp)
        {
            if (resp == null)
            {
                return(null);
            }

            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(UFileError));
            UFileError obj = (UFileError)ser.ReadObject(resp);

            return(obj);
        }