public List <StockSize> GetAllStockSizes()
    {
        List <StockSize> stockSizes = new List <StockSize>();
        StockSizesDAO    dao        = new StockSizesDAO();

        stockSizes = dao.GetAllStockSizes();
        return(stockSizes);
    }
    public List <StockSize> GetAllStockSizes(int productId)
    {
        List <StockSize> stockSizes = new List <StockSize>();
        StockSizesDAO    dao        = new StockSizesDAO();

        stockSizes = dao.GetAllStockSizes();
        stockSizes = stockSizes.FindAll(ss => ss.productId.Equals(productId));
        return(stockSizes);
    }