Visibility of nested class constructor

Question

Is there a way to limit the instantiation of the nested class in C#? I want to prevent nested class being instantiated from any other class except the nesting class, but to allo

Answer 1

For the answer proposed by Joshua Smith I found it necessary to force the static constructor of FriendClass to run, achieved by calling an empty static Initalize() method on FriendClass from the static constructor of ParentClass.