用于练习的自定义链表c# -不确定我的插入不起作用的原因

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

public class LinkedList
{
    private Node head;

    public void Insert(int data)
    {
        Node newNode = new Node();
        newNode.Data = data;

        if (head == null)
        {
            head = newNode;
        }
        else
        {
            Node current = head;
            while (current.Next != null)
            {
                current = current.Next;
            }
            current.Next = newNode;
        }
    }
}