Help: show daily percent profit on chart

i got 2 error here.

1: i want when user change timezone in ctrader indicator timezone changed.actully i want to get Net profit,history profit and starting balance based on user time zone

2: when i have no history trade for today, indicaotr show nothing and after 1 position closed it start and work perfectly.

actully a want to get Net profit,history profit and starting balance based on user time zone

//khoshroomahdi Create thid indicator for  AcademyWave



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

namespace cAlgo
{
    // This sample indicator shows how to add a text block control on your chart
    [Indicator(IsOverlay = true, TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class AWMultiData : Indicator
    {


        double StartingBalance;

        TextBlock tb = new TextBlock();


        //User Parameter
        [Parameter("FontSize", DefaultValue = 12)]
        public int FontSize { get; set; }
        [Parameter("Space to Corner", DefaultValue = 10)]
        public int Margin { get; set; }
        [Parameter("Horizental Alignment", DefaultValue = HorizontalAlignment.Right)]
        public HorizontalAlignment HAlignment { get; set; }
        [Parameter("Vertical Alignment", DefaultValue = VerticalAlignment.Bottom)]
        public VerticalAlignment VAlignment { get; set; }
        [Parameter("Color", DefaultValue = "Red")]
        public string Color1 { get; set; }
        [Parameter("Opacity", DefaultValue = 0.7, MinValue = 0.1, MaxValue = 1)]
        public double Opacity { get; set; }

        [Parameter("Text Alignment", DefaultValue = TextAlignment.Center)]
        public TextAlignment Alignment { get; set; }


        protected override void Initialize()
        {



        }
        public override void Calculate(int index)
        {

            if (IsLastBar)
                DisplaySpreadOnChart();
        }

        public void DisplaySpreadOnChart()
        {
            // Calc Spread    
            var spread = Math.Round(Symbol.Spread / Symbol.PipSize, 2);
            string sp = string.Format("{0}", spread);



            //Calc daily Net Profit
            double DailyNet1 = Positions.Sum(p => p.NetProfit);
            double DailyNet2 = History.Where(x => x.ClosingTime.Date == Time.Date).Sum(x => x.NetProfit);
            double DailyNet = DailyNet1 + DailyNet2;



            // get Starting Balance
            StartingBalance = History.Where(x => x.ClosingTime.Date.Day == Server.Time.Date.Day).OrderByDescending(x => x.EntryTime).Last().Balance;


            //calc Daily Percent Profit

            string DailyPercent = Math.Round(DailyNet / StartingBalance * 100, 2).ToString();


            //text property
            tb.Text = Symbol.Name + ", " + TimeFrame.ShortName + "\n" + DailyPercent + " %" + "\n" + DailyNet + " $" + "\n" + sp;
            tb.FontSize = FontSize;
            tb.ForegroundColor = Color1.TrimEnd();
            tb.HorizontalAlignment = HAlignment;
            tb.VerticalAlignment = VAlignment;
            tb.TextAlignment = Alignment;
            tb.Margin = Margin;
            tb.Opacity = Opacity;

            //add text to chart
            Chart.AddControl(tb);
        }



    }


}