Help-translate-my-WL6-trading-system-to-WL7

CODE:
using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using WealthLab;
using WealthLab.Indicators;

namespace WealthLab.Strategies
{
   public class PC1_PS_FET : BacktestHelper2.WealthScript
   {
      private StrategyParameter _period;
      private StrategyParameter _timeexit;// - время выхода

      public PC1_PS_FET()
      {
         _period = CreateParameter("Период Канала: ", 230, 30, 500, 5); 
         _timeexit = CreateParameter("Время выхода: ", 20, 10, 24, 2); 
      }

      protected override void Execute()
      {
         HideVolume();
         int firstValidValue = 0; 
         int period = _period.ValueInt; 
         int timeexit = _timeexit.ValueInt;

         #region   Построение каналов

         // Верхний канал

         DataSeries highLevel = Highest.Series(High, period);
         highLevel = highLevel >> 1; 
         highLevel.Description = string.Format("Единый канал , период: {0}", period);
         PlotSeries(PricePane, highLevel, Color.Green, LineStyle.Solid, 2);
         firstValidValue = Math.Max(firstValidValue, highLevel.FirstValidValue);

         // Нижний канал 

         DataSeries lowLevel = Lowest.Series(Low, period);
         lowLevel = lowLevel >> 1;
         PlotSeries(PricePane, lowLevel, Color.Red, LineStyle.Solid, 2);
         firstValidValue = Math.Max(firstValidValue, lowLevel.FirstValidValue);

         // Верхний канал размер позиции


         DataSeries highLevelPS = Highest.Series(Close, period); 
         highLevelPS = highLevelPS >> 1; 
         firstValidValue = Math.Max(firstValidValue, highLevelPS.FirstValidValue);

         // Нижний канал размер позиции

         DataSeries lowLevelPS = Lowest.Series(Close, period);
         lowLevelPS = lowLevelPS >> 1; 
         firstValidValue = Math.Max(firstValidValue, lowLevelPS.FirstValidValue);

         #endregion

         for (int bar = firstValidValue; bar < Bars.Count - 1; bar++)
         {
            #region   FET

            if (Date[bar].DayOfWeek == System.DayOfWeek.Friday &&      
               Date[bar].TimeOfDay >= new System.TimeSpan(timeexit, 0, 0))               
            {
               if (IsLastPositionActive) //если позиция есть:          
                  ExitAtMarket(bar + 1, LastActivePosition, "ForceExitAtFriday");         

               continue;      
            } 

            if (CloseAtExpiration(bar)) continue; 

            if (ClosePositionsLogic(bar)) continue;
                   
            #endregion

            if (IsLastPositionActive) //если позиция есть:
            {
               if (LastActivePosition.PositionType == PositionType.Long) 
               {
                  if (Low[bar] < lowLevel[bar])
                  {
                     ExitAtLimit(bar + 1, LastActivePosition, (High[bar] + Low[bar]) / 2);
                  }
               }
               else //если позиция короткая
               {
                  if (High[bar] > highLevel[bar])
                  {
                     ExitAtLimit(bar + 1, LastActivePosition, (High[bar] + Low[bar]) / 2);
                  }
               }
            }
            else //если позиции нет:
            {
               if (High[bar] > highLevel[bar])
               {
                  RiskStopLevel = lowLevelPS[bar];
                  BuyAtLimit(bar + 1, (High[bar] + Low[bar]) / 2);
               }
               else if (Low[bar] < lowLevel[bar])
               {
                  RiskStopLevel = highLevelPS[bar];
                  ShortAtLimit(bar + 1, (High[bar] + Low[bar]) / 2);
               }
            }

         }
      }
   }
}