Bollinger Bands BO Strategy Help

Hello I would very much appreciate if someone could help me with the code of a bot ive been editing all credit goes to [HJozan], im not very good with coding so im sorry if i get the wrong terminology i found the arrows show up to early and not when the bar closes i could normally fix the problem by adding the "OnBar();" identifyer 

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e.g. public OnBar(); override void Calculate(int index) 

but when i do i get this change of code,

  public override void OnBar();
        BBREVERSALCODE(int index)

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and if i try 

override void Calculate(int index)  OnBar(); 

I get 25 Errors so i know im way off 

can anyone edit the code so it only displays an arrow ONLY IF the price CLOSES above/below the bollinger bands, but NO ARROW if it just touches the BB in the candles time.

Thankyou very much.

using System;
using System.Linq;
using cAlgo.API;
using cAlgo.API.Indicators;
using cAlgo.API.Internals;
using cAlgo.Indicators;

namespace cAlgo
{
    [Indicator(IsOverlay = true, AccessRights = AccessRights.None)]
    public class BBREVERSALCODE : Indicator
    {

        private BollingerBands bbds;

        protected override void Initialize()
        {

            bbds = Indicators.BollingerBands(MarketSeries.Close, 30, 3, MovingAverageType.Simple);
        }

        public override void Calculate(int index)
        {


            if (bbds.Top[index + -0] < MarketSeries.High[index + -0])
            {
                ChartObjects.DrawText(index.ToString(), "▼", index, MarketSeries.High[index + -0] + Symbol.PipSize, VerticalAlignment.Top, HorizontalAlignment.Center, Colors.Red);
            }



            if (bbds.Bottom[index + -0] > MarketSeries.Low[index + -0])
            {
                ChartObjects.DrawText(index.ToString(), "▲", index, MarketSeries.Low[index + -0] - Symbol.PipSize, VerticalAlignment.Bottom, HorizontalAlignment.Center, Colors.Green);
            }



        }
    }
}