private static void realTimeBars(EClientSocket client)
 {
     client.reqRealTimeBars(3004, ContractSamples.FuturesOnOptionsES(), 5, "TRADES", true, null);
     //! [reqrealtimebars]
     Thread.Sleep(1000);
     /*** Canceling real time bars ***/
     //! [cancelrealtimebars]
     client.cancelRealTimeBars(3004);
     //! [cancelrealtimebars]
 }