Buy-when-Close-is-above-MA-ATR-factor-in-Blocks

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

namespace WealthScript1 
{
    public class MyStrategy : UserStrategyBase
    {
      IndicatorBase dsU, dsL;
      
        //create indicators and other objects here, this is executed prior to the main trading loop
        public override void Initialize(BarHistory bars)
        {
         var sma = SMA.Series(bars.Close, 20);
         dsU = ATRBandUpper.Series(bars, sma, 20, 2.5);
         dsL = ATRBandLower.Series(bars, sma, 20, 2.5);
         PlotIndicatorBands(dsU, dsL);
        }

        //execute the strategy rules here, this is executed once for each bar in the backtest history
        public override void Execute(BarHistory bars, int idx)
        {
         if (!HasOpenPosition(bars, PositionType.Long))
            {
            //code your buy conditions here
            //Buy = Close < MA(Close, 20) - (ATR(20) *2.5)
            PlaceTrade(bars, TransactionType.Buy, OrderType.Limit, dsL[idx]);
            }
            else
            {
            //code your sell conditions here
            //Sell ​​= Close > MA(Close, 20) + (ATR(20) * 2.5)
               PlaceTrade(bars, TransactionType.Sell, OrderType.Limit, dsU[idx]);

         }
        }

        //declare private variables below

    }
}