Combining-Bollinger-Bands-With-Candlesticks-Kosinski

CODE:
using WealthLab.Backtest;
using System;
using WealthLab.Core;
using WealthLab.Indicators;
using System.Drawing;
using System.Collections.Generic;
using WealthLab.Candlesticks;

namespace WealthScript123
{
    public class TASC201910 : UserStrategyBase
    {
        //create indicators and other objects here, this is executed prior to the main trading loop
        public override void Initialize(BarHistory bars)
        {
         StartIndex = 20;
         _bbL = BBLower.Series(bars.Close, 20, 2.0);
         _bbU = BBUpper.Series(bars.Close, 20, 2.0);
         PlotIndicatorLine(_bbL);
         PlotIndicatorLine(_bbU);
         try
         {
            _tickSize = bars.SymbolInfo.TickSize;
         }
         catch
         {
            _tickSize = 0.01;
         }

         _cp = CandleGeneDecoder.FindPattern("Bullish Engulfing");
         for (int n = 0; n < bars.Count; n++)
         {
            if (CandleGeneDecoder.DetectPattern(bars, n, _cp))
            {
               _cfi = new CandleEventItem(_cp, bars.DateTimes[n]);
               _cbg = new CandleBarGlyph(_cfi, _cp);
               DrawCustomBarGlyph(n, _cbg);
            }
         }
        }

        //execute the strategy rules here, this is executed once for each bar in the backtest history
        public override void Execute(BarHistory bars, int bar)
        {
         if (!HasOpenPosition(bars, PositionType.Long))
         {
            //touches the lower band
            double C1 = bars.Close[bar - 1];
            double C2 = bars.Close[bar - 2];
            double O1 = bars.Open[bar - 1];
            double O2 = bars.Open[bar - 2];
            double L1 = bars.Low[bar - 1];
            double L2 = bars.Low[bar - 2];
            bool WL6engulfing = C2 < O2 && C1 > O1 && O1 < C2 && C1 > O2 &&
               (C1 - O1 > 20 * _tickSize) && bars.Close[bar] > bars.High[bar - 1];

            if (WL6engulfing)
            {
               SetBackgroundColor(bars, bar, Color.FromArgb(40, Color.Blue));
               
               if ((C1 > _bbL[bar - 1]) && (L1 < _bbL[bar - 1] || L2 < _bbL[bar - 2]))
                  PlaceTrade(bars, TransactionType.Buy, OrderType.Market);
            }
         }
         else
         {
            if (bars.High[bar] > _bbU[bar])
            PlaceTrade(bars, TransactionType.Sell, OrderType.Market);
         }
        }

      CandleGenePattern _cp;
      CandleEventItem _cfi;
      CandleBarGlyph _cbg;
      BBLower _bbL;
      BBUpper _bbU;
      double _tickSize;
    }
}