Add.cs

public void Add(Person person)
  {
    Node node = CreateNode(person);           
    if (Head == null)
      {
        Head = node;
        return;
      }
    if(Head.Next == null)
      {
        Head.Next = node;
        return;
      }
    Node current = Head;
    while(current.Next != null)
      {
        current = current.Next;
      }
    current.Next = node;
  }