static void Main(string[] args)
{
DLinkedList node1 = new DLinkedList(1);
DLinkedList node3 = node1.InsertNext(3);
DLinkedList node2 = node3.InsertPrev(2);
DLinkedList node5 = node3.InsertNext(5);
DLinkedList node4 = node5.InsertPrev(4);
node1.TraverseFront();
node5.TraverseBack();
}
