private void ProductStockInformationUpdatedEventHandler(ProductStockInformationUpdated e)
{
//if(e.ProductId != Id) throw new InvalidEvent
_unitsInStock = e.UnitsInStock;
}
public void UpdateTheNumberOfUnitsInStock(int? unitsInStock)
{
var e = new ProductStockInformationUpdated(Id, unitsInStock);
ApplyEvent(e);
}
