Build-indicator-RSI-of-EMA-Close-Open

CODE:
using WealthLab.Core;
using System;
using WealthLab.Indicators;

namespace WealthLab.MyIndicators
{
    public class RSIofEMA : IndicatorBase
    {
        public RSIofEMA() : base() { }

        public RSIofEMA(TimeSeries source, int period1, int period2) : base()
        {
            Parameters[0].Value = source;
            Parameters[1].Value = period1;
         Parameters[2].Value = period1;
            Populate();
        }

        public static RSIofEMA Series(TimeSeries source, int period1, int period2) => new RSIofEMA(source, period1, period2);
        public override string Name => "RSI of EMA";
        public override string Abbreviation => "RSIofEMA";
        public override string HelpDescription => "RSI of EMA(Close-Open)";
        public override string PaneTag =>  "RSIofEMA";

        public override void Populate()
        {
         BarHistory source = Parameters[0].AsBarHistory;
            Int32 period1 = Parameters[1].AsInt;
         Int32 period2 = Parameters[2].AsInt;
            DateTimes = source.DateTimes;
            if (period1 <= 0 || period2 <= 0)
                return;
         TimeSeries co = source.Close - source.Open;
         TimeSeries coema = EMA.Series(co, period1);
         TimeSeries newind = RSI.Series(coema, period2);
            for (int n = 0; n < source.Count; n++)
            Values[n] = newind[n];
        }

        protected override void GenerateParameters()
        {
            AddParameter("Source", ParameterType.BarHistory, null);
            AddParameter("Period1", ParameterType.Int32, 10);
         AddParameter("Period2", ParameterType.Int32, 20);
        }
    }
}