Непонятная работа IMarketDataStorage

private IMarketDataStorage<Trade> _tradeStorage;
private Security _sec;

...

_sec= new Security {
                Id = "TestId",
                MinStepSize = 0.1m,
                Decimals = 1
            };

StorageRegistry storage = new StorageRegistry();
((LocalMarketDataDrive)storage.DefaultDrive).Path = @"E:\TestStockSharpStorage";
_tradeStorage = storage.GetTradeStorage(_sec);


...

private List<Trade> GenereateTrades(int amount) {
            List<Trade> trades = new List<Trade>();

            var tradeGenerator = new RandomWalkTradeGenerator(_sec, 99) {
                IdGenerator = new IdGenerator {
                    Current = DateTime.Now.Ticks
                }
            };
            tradeGenerator.Init();

            for (var i = 0; i < amount; i++) {
                var t = tradeGenerator.Generate(DateTime.Today + TimeSpan.FromMinutes(i));
                t.Id = i + 1;
                t.Status = 2;
                var dic = new Dictionary<object, object>();
                dic.Add("Parameter", 1.1m);
                t.ExtensionInfo = dic;

                trades.Add(t);
            }

            return trades;
}

private void b_CreateTicks_Click(object sender, RoutedEventArgs e) {
            var trades = GenereateTrades(100);
            _tradeStorage.Save(trades);
}

private void b_ReadData_Click(object sender, RoutedEventArgs e) {
            List<Trade> loadedTrades = _tradeStorage.Load(DateTime.Now.Date).ToList();
}