在C#中创建循环链表？

using System;

public class Node {
    public int Data { get; set; }
    public Node Next { get; set; }

    public Node(int data) {
        Data = data;
        Next = null;
    }
}

public class CircularLinkedList {
    public Node Head { get; set; }

    public CircularLinkedList() {
        Head = null;
    }

    public void AddNode(int data) {
        Node newNode = new Node(data);

        if (Head == null) {
            Head = newNode;
            Head.Next = Head;
        } else {
            Node current = Head;

            while (current.Next != Head) {
                current = current.Next;
            }

            current.Next = newNode;
            newNode.Next = Head;
        }
    }
}

public class Program {
    public static void Main(string[] args) {
        CircularLinkedList list = new CircularLinkedList();

        list.AddNode(1);
        list.AddNode(2);
        list.AddNode(3);
        list.AddNode(4);
        list.AddNode(5);

        Node current = list.Head;

        do {
            Console.WriteLine(current.Data);
            current = current.Next;
        } while (current != list.Head);
    }
}