volume information retrieval

Hello, I'm new here and I'm starting to create my own trading bot, it's the first time I'm getting into C#, I more or less understand how it works but I'm facing a small problem.
On the bot that I try to create, I would like to make it enter in position when the volume indicator is higher than 215 but I can't understand how to get the information of this one, in the indicators I see all the volume indicators but not the simple one, the one that has automatically on the charts, if someone could give me a hand thanks.

PS : sorry the comments are in french in the code lol

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using cAlgo.API;
using cAlgo.API.Collections;
using cAlgo.API.Indicators;
using cAlgo.API.Internals;

namespace cAlgo.Robots
{
    [Robot(TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class RobotVolumeDow : Robot
    {
        [Parameter("Initialisation", DefaultValue = "salut beau gosse")]
        public string Message { get; set; }
                                       
        [Parameter("Initial Quantity (Lots)", Group = "Volume", DefaultValue = 1, MinValue = 0.01, Step = 0.01)]
        public double InitialQuantity { get; set; }

        [Parameter("Stop Loss", Group = "Protection", DefaultValue = 40)]
        public int StopLoss { get; set; }

        [Parameter("Take Profit", Group = "Protection", DefaultValue = 40)]
        public int TakeProfit { get; set; }
        
        [Parameter("Add Pips", Group = "Break Even", DefaultValue = 0.0, MinValue = 0.0)]
        public double AddPips { get; set; }

        [Parameter("Trigger Pips", Group = "Break Even", DefaultValue = 10, MinValue = 1)]
        public double TriggerPips { get; set; }
        
        [Parameter("MA Type", Group = "Moyenne Mobile")]
        public MovingAverageType MAType { get; set; }

        [Parameter("Source", Group = "Moyenne Mobile")]
        public DataSeries SourceSeries { get; set; }

        [Parameter("Slow Periods", Group = "Moyenne Mobile", DefaultValue = 70)]
        public int SlowPeriods { get; set; }
        
        private MovingAverage slowMa;

        [Parameter("Fast Periods", Group = "Moyenne Mobile", DefaultValue = 30)]
        public int FastPeriods { get; set; }
        
        private MovingAverage fastMa;
        
        [Parameter("source", Group = "Niveau de Volume")]
        public DataSeries SourceVolume {get; set; }
        
        [Parameter("Niveau de Volume", Group = "Niveau de Volume", DefaultValue = 215)]
        public int NiveauVolume { get; set; }
                            
        [Parameter("Heure de Début", Group = "Horaire", DefaultValue = 15, MinValue = 00, MaxValue = 24, Step = 1)]
        public int HeureDeDebut { get; set; }
        
        [Parameter("Minute de Début", Group = "Horaire", DefaultValue = 30, MinValue = 00, MaxValue = 60, Step = 1)]
        public int MinuteDeDebut { get; set; }
        
        [Parameter("Heure de Fin", Group = "Horaire", DefaultValue = 21, MinValue = 00, MaxValue = 24, Step = 1)]
        public int HeureDeFin { get; set; }
        
        [Parameter("Minute de Fin", Group = "Horaire", DefaultValue = 30, MinValue = 00, MaxValue = 60, Step = 1)]
        public int MinuteDeFin { get; set; }          
                   
        protected override void OnStart()
        {   
            
            fastMa = Indicators.MovingAverage(SourceSeries, FastPeriods, MAType);
            slowMa = Indicators.MovingAverage(SourceSeries, SlowPeriods, MAType);
            
                    }       
      
        protected override void OnTick()
        {
            
        }
        
        protected override void OnBar()
        {      
            if (SlowPeriods > FastPeriods && Server.Time.Hour > HeureDeDebut && Server.Time.Minute > MinuteDeDebut 
            && Server.Time.Hour < HeureDeFin && Server.Time.Minute < MinuteDeFin)           
            
            ExecuteMarketOrder(TradeType.Buy, SymbolName, InitialQuantity, "RobotVolumeDow", StopLoss, TakeProfit);
        }

        protected override void OnStop()
        {
            // Handle cBot stop here
        }
    }
}