What is wrong, if cross line then onpe buy or sell repeatedly but I want only open position if close bar

    if (!isBuyPositions && isSOCBuySignal && _TMA1.Result.LastValue > _TMA2.Result.LastValue)
            {
                closePositions(TradeType.Sell);
                Open(TradeType.Buy);
            }
            if (!isSellPositions && _SMA.Result.LastValue > MarketSeries.Close.LastValue && _TMA1.Result.LastValue > _TMA2.Result.LastValue)
            {
                closePositions(TradeType.Buy);

            }

            if (!isBuyPositions && _SMA.Result.LastValue < MarketSeries.Close.LastValue && _TMA1.Result.LastValue < _TMA2.Result.LastValue)
            {
                closePositions(TradeType.Sell);

            }
            if (!isSellPositions && isSOCSellSignal && _TMA1.Result.LastValue < _TMA2.Result.LastValue)
            {
                Open(TradeType.Sell);
                closePositions(TradeType.Buy);

            }