Else Use List. You dirilik't really argue "oh but I KNOW that I will always pass in a List here", then you should take a List not an IList, else you are breaking Liskov substitution principle: "if S is a subtype of T, then objects of type T may be https://cobjectkullanm64859.total-blog.com/5-basit-teknikleri-için-c-ilist-nedir-53252699