public MessageResult sendPush(string payloadString)
 {
     Preconditions.checkArgument(!string.IsNullOrEmpty(payloadString), "payloadString should not be empty");
    
     String url = HOST_NAME_SSL;
     url += PUSH_PATH;
     ResponseWrapper result = sendPost(url, Authorization(), payloadString);
     MessageResult messResult = new MessageResult();
     messResult.ResponseResult = result;
    
     JpushSuccess jpushSuccess = JsonConvert.DeserializeObject<JpushSuccess>(result.responseContent);
     messResult.sendno = int.Parse(jpushSuccess.sendno);
     messResult.msg_id = int.Parse(jpushSuccess.msg_id);
    
     return messResult;
 }