private List <ChatGroupMessage> GetMessages(string groupId)
 {
     lock (syncLock)
     {
         IChatGroupMessageDAO db = new ChatGroupMessageDAOSQL();
         return(db.GetMessages(groupId));
     }
 }
 private int InsertMessage(ChatDataModel.ChatGroupMessage message)
 {
     lock (syncLock)
     {
         IChatGroupMessageDAO db = new ChatGroupMessageDAOSQL();
         return(db.Insert(message));
     }
 }