class member declaratione expeced ,identifier expected in c# cs1003,1002,1519 errors

[[email protected]]

Hello,
1. This my part of code from xyz.cs.

public void AddVolume(double price, long volume, TradeSide side, DateTime time, int barIdx)
        {
            if (ladder.Count == 0)
            {
                Begin = time;
                BeginBarIdx = barIdx;
            }
            End = time;
            EndBarIdx = barIdx;

            AddVolume(price, volume, side);
            close[barIdx] = price;
        }
	
//	}            //newly added 
        public long GetPOCVolume() => ladder.Max(kv => kv.Value);
//the above line getting  class member declaratione expected and ; expected => here
        public long GetPOCVolume(TradeSide side) => ladderBidAsk[(int)side].Max(kv => kv.Value);//identifier expected here

        public long Volume() => ladder.Sum(kv => kv.Value);//invali token ) class struct and the interface

        public bool IsEmpty() => ladder.Count == 0;//invalid token => class struct ad interface declaratione

please revert me so long am facing this error

[NinjaTrader_JessicaP]

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