public void Dispose()
{
linkedlist = null;
trav = null;
prev = null;
}
public void Reset()
{
trav = linkedlist.head;
prev = null;
}
public DoublyLinkedListEnumerator(DoublyLinkedList <T> linkedlist)
{
this.linkedlist = linkedlist;
trav = this.linkedlist.head;
prev = trav.prev;
}