private void ProductSellPriceChangedEventHandler(ProductSellPriceChangedEventPayLoad payload)
        {
            this.Eruo2Cny = payload.Euro2Cny;
            this.SecondServiceRate = payload.SecondServiceRate;

            RecalculateCommand.Execute();
        }
        private void ProductSellPriceChangedEventHandler(ProductSellPriceChangedEventPayLoad payload)
        {
            this.Eruo2Cny = payload.Euro2Cny;
            this.SecondServiceRate = payload.SecondServiceRate;
            foreach (var item in this.ProductList)
            {
                item.Euro2Cny = this.Eruo2Cny * this.SecondServiceRate;
            }

        }
        private void ProductSellPriceChangedEventHandler(ProductSellPriceChangedEventPayLoad payload)
        {
            this.Eruo2Cny = payload.Euro2Cny;
            this.SecondServiceRate = payload.SecondServiceRate;

        }