public void UnsubscribeToUpdates(long accountId)
 {
     try
     {
         this.lastSubscribedAccountId = null;
         ApiAccessor.UnsubscribeToUpdates(new AccountMessageData(accountId), this.OnMessageDataUpdated);
     }
     catch (Exception e)
     {
         Logger.DisplayError("Account " + accountId + " failed to unsubscribe from updates", e);
     }
 }