Does foreach() iterate by reference?

Question

Consider this:

List obj_list = get_the_list();
foreach( MyClass obj in obj_list )
{
    obj.property = 42;
}

Is obj

Answer 1

obj is a reference to an item inside the List, hence if you change it's value it will persist. Now what you should be concerned about is whether or not get_the_list(); is making a deep copy of the List or returning the same instance.