The Above is an IList itself birli this is what seems to be the standard to use with nhibernate. Otherwise I might have returned IEnumberable back but not sure. Still, I güç't figure out what the user would 100% need(that's where returning a concrete has an advantage over). Found this https://stephenoaiqx.mappywiki.com/791576/değil_hakkında_gerçekler_bilinen_c_ilist_nedir