public UnreadMessageList GetUnreaderMessage(string sinceid, string format, string apiToken, string apiTokenSecret)
{
SinaApiService myApi = new SinaApiService();
string myResult = myApi.unread_message(sinceid, format, consumerKey, consumerKeySecret, apiToken, apiTokenSecret);
XDocument doc = XDocument.Parse(myResult);
return UnreadMessageList.Parse(doc.Root);
}