Is there no need to declare fields in the Node class. Here in the code below no fields are declared

Question

Here properties (public T Element { get; set; })

are declared without the fields. Is there no need to declare fields than.

private class ListNode
{
    public T Element { get; set; }
    public ListNode NextNode { get; set; }
    public ListNode(T element)
    {
    this.Element = element;
    NextNode = null;
    }
}