static void Main(string[] args) { Console.WriteLine("Hello World!"); Stack s = new Stack(); DoublyLinkedList <int> linkedList = new DoublyLinkedList <int>(new int[] { 1, 2, 3, 3, 44, 4 }); Console.WriteLine("first value is {0}", linkedList.First.Value); linkedList.AddBefore(linkedList.First, 100); Console.WriteLine("first value is {0}", linkedList.First.Value); Console.Read(); }