@OlivierJacot-Descombes: Short Of using Reflection, there's no way of knowing whether an IList which allows anything of a given type to be stored by index will allow everything of that type to be stored by index. So when you have to simply iterate through the in-memory collection, use IEnumerable, if https://mariopbkry.vigilwiki.com/6195199/5_basit_teknikleri_için_c_ienumerable_nerelerde_kullanılıyor