Technically C# does not allow functions to be outside of a class, however you could debate that static methods of a static class are functions and not methods. This is a good explanation here: stackoverflow.com/a/155655/2146952 Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical https://ricardohpvze.suomiblog.com/değil-hakkında-detaylar-bilinen-c-ienumerator-nasıl-kullanılır-43574254