If Your class is a custom collection class then yes, it should implement IEnumerable. In this case a public property for the inner list would be redundant. Imagine a simple class: I noticed that if I use IEnumerable, when I debug and inspect "yığın", which in that case is the https://eduardomdmub.wikififfi.com/789685/en_iyi_tarafı_c_ienumerable_nerelerde_kullanılıyor