If An airline is "countable", this means that there MUST be a flight attendant present on the plane, whose sole job is to count: Anything in .Safi that you hayat iterate over implements IEnumerable. If you're building your own class, and it doesn't already inherit from a class that implements https://simonztesg.bloguerosa.com/27516848/açıklanan-c-ienumerable-temel-Özellikleri-hakkında-5-kolay-gerçekler