Take profit

Please help ,
where TP1 is moved to TP2: , using pendingorder execution. new takeprofit is not working. 
 result = TP1> TP2.
protected override void OnTick()
        {
            var longPosition = Positions.Find("_TP plus", SymbolName, TradeType.Buy);

            if (longPosition == null) && (TP1 > TP2)
            {
                PendingLimitOrder(TradeType.Buy, SymbolName, 100000, "TP plus", StopLoss, TakeProfit);
            }
            else
            {
                if (longPosition.Pips >= Symbol.PipSize * 50)&& (TP1 > TP2)
                    ModifyPosition(longPosition, 30, TakeProfit);
                  if (longPosition.Pips >= 50)

					ModifyPosition(longPosition, longPosition.EntryPrice + Symbol.PipSize * 30, longPosition.TakeProfit);

		            Print(result); 
		            Thank you