In C# if an object in a list is added to another list, does changing the object in the second list change the same object in the first list?

Question

Say I have a list of Person objects (List) called persons, like this:

class Person
{
    public int PersonId         


        

Answer 1

When you have a list of objects that are reference types and not value types, that is stored in the list is a reference for each object in the list. Hence if you add the same object to two different lists, you actually add to the second list the same reference. Hence if you make any change in the object, this would be "visible" from both lists.