public void TestAddSymbolsCandle()
        {
            TestListener listener           = new TestListener(eventsTimeout, eventsSleepTime, IsConnected);
            string       candleSymbolString = "XBT/USD{=d}";
            string       aaplSymbolString   = "AAPL{=d,price=mark}";
            string       ibmSymbolString    = "IBM{=d,price=mark}";

            using (var con = new NativeConnection(address, OnDisconnect))
            {
                Interlocked.Exchange(ref isConnected, 1);
                using (IDxSubscription s = con.CreateSubscription(defaultDateTime, listener))
                {
                    //add candle symbol
                    s.AddSymbol(CandleSymbol.ValueOf(candleSymbolString));
                    IList <string> returnedSymbolList = s.GetSymbols();
                    Assert.AreEqual(1, returnedSymbolList.Count);
                    Assert.AreEqual(candleSymbolString, returnedSymbolList[0]);
                    listener.WaitEvents <IDxCandle>(candleSymbolString);

                    listener.ClearEvents <IDxCandle>();

                    //try to add other candle symbols
                    s.AddSymbols(new CandleSymbol[] {
                        CandleSymbol.ValueOf(aaplSymbolString),
                        CandleSymbol.ValueOf(ibmSymbolString)
                    });
                    returnedSymbolList = s.GetSymbols();
                    Assert.AreEqual(3, returnedSymbolList.Count);
                    listener.WaitEvents <IDxCandle>(new string[] {
                        candleSymbolString,
                        aaplSymbolString,
                        ibmSymbolString
                    });
                }
            }
        }