How to make IEnumerable readonly?

Question

Why are the lists list1Instance and p in the Main method of the below code pointing to the same collection?

class Person
         


        

Answer 1

First of all, your List in your class is public, so there's nothing stopping anyone from directly accessing the list itself.

Secondly, I would implement IEnumerable and return this in my GetEnumerator Method

return l1.AsReadOnly().GetEnumerator();