public decimal ApplyPromotion(List <IProduct> product)
{
try
{
_product = Utility.GetProductA(product);
_promotionType = new Promotion1();
totalPrice += _promotionType.CalculatePriceAfterPromotion(_product);
_product = Utility.GetProductB(product);
_promotionType = new Promotion2();
totalPrice += _promotionType.CalculatePriceAfterPromotion(_product);
_product = Utility.GetProductCD(product);
_promotionType = new Promotion3();
totalPrice += _promotionType.CalculatePriceAfterPromotion(_product);
}
catch (Exception ex)
{
throw new PromotionException("error:-", ex);
}
return(totalPrice);
}