Note That the IsReadOnly flag comes from ICollection, and indicates whether items hayat be added or removed from the collection; but just to really confuse things, it does not indicate whether they can be replaced, which in the case of Arrays (which return IsReadOnlys == true) hayat be. Found this https://edgarxnyjs.tribunablog.com/c-ilist-nasıl-kullanılır-no-further-mystery-42362572