private void InstanceOnMarketDataUpdate(ExchangeBase exchangeBase)
 {
    if (txtBidPx.InvokeRequired)
    {
       txtBidPx.Invoke(new EventHandler((sender, args) => UpdateGui(exchangeBase)));
    }
 }
      private void UpdateGui(ExchangeBase exchangeBase)
      {
         try
         {
            txtBidSz.Text = exchangeBase.MarketData.BidSz.ToString();
            txtBidPx.Text = exchangeBase.MarketData.Bid.ToString();
            txtAskPx.Text = exchangeBase.MarketData.Ask.ToString();
            txtAskSz.Text = exchangeBase.MarketData.AskSz.ToString();

         }
         catch (Exception ex)
         {
            Logger.LogException(ex);
         }
      }