public static void Init()
        {
            //Node node1111 = new Node(1111);
            //Node node111 = new Node(111);
            //Node node11 = new Node(11);
            //Node node12 = new Node(12);
            //Node node1 = new Node(1);
            //Node root = new Node(0);
            //Node node2 = new Node(2);
            //Node node21 = new Node(21);
            //Node node211 = new Node(211);
            //root.Childs.Add(node1);
            //root.Childs.Add(node2);
            //node1.Childs.Add(node11);
            //node1.Childs.Add(node12);
            //node11.Childs.Add(node111);
            //node111.Childs.Add(node1111);
            //node2.Childs.Add(node21);
            //node21.Childs.Add(node211);

            //List<Node> path = root.Depth;
            //foreach (Node n in path)
            //    Console.Write(String.Format("{0} - ", n.ToString()));

            //Console.WriteLine();

            //Node node2111 = new Node(2111);
            //node2111.Childs.Add(new Node(21111));
            //node211.Childs.Add(node2111);

            //path = root.Depth;
            //foreach (Node n in path)
            //    Console.Write(String.Format("{0} - ", n.ToString()));

            //Console.WriteLine();

            //            15
            //   5                 25
            //2    10          22       29
            //   7    12     21  23  27    30
            // 6   8                    28

            Console.WriteLine("Print after insert Node");
            Node rootRD = new Node(15);

            rootRD.Insert(5);
            rootRD.Insert(10);
            rootRD.Insert(25);
            rootRD.Insert(22);
            rootRD.Insert(29);
            rootRD.Insert(2);
            rootRD.Insert(7);
            rootRD.Insert(12);
            rootRD.Insert(6);
            rootRD.Insert(8);
            rootRD.Insert(21);
            rootRD.Insert(23);
            rootRD.Insert(27);
            rootRD.Insert(30);
            rootRD.Insert(28);
            rootRD.PrintTree();
            Console.WriteLine("Is node with value 13 present? " + Node.IsPresent(rootRD, 13).ToString());
            Console.WriteLine("Leave nodes are :"); rootRD.PrintLeaves();
            Console.WriteLine("Outer nodes are :"); rootRD.PrintOuterNodes();
        }