Close-order-at-a-specific-hour

CODE:
public override void Execute(BarHistory bars, int idx) {
         if(bars.DateTimes[idx].GetTime() == 1600) {
            PlaceTrade(bars, TransactionType.Sell, OrderType.Market);
         }
         
         PlaceTrade(bars, TransactionType.Buy, OrderType.Limit, source[idx +1]);
         //PlaceTrade(bars, TransactionType.Sell, OrderType.MarketClose);
         PlaceTrade(bars, TransactionType.Sell, OrderType.Stop, stop[idx +1]);
         }