Prevent other classes from altering a list in a class

Question

If I have a class that contains, for example, a List and I want other classes to be able to see the list but not set it, I can declare

Answer 1

You'll want to return the list as a ReadOnly list. You can do this with the following code:

using System.Collections.ObjectModel;

public ReadOnlyCollection GetList() {
    return SomeList.AsReadOnly();
}