System.util.collections.OrderedTree.OrderedTree C# (CSharp) Method

        public OrderedTree()
        {
            // set up the sentinel node. the sentinel node is the key to a successfull
            // implementation and for understanding the red-black tree properties.
            sentinelNode = new OrderedTreeNode();
            sentinelNode.Left = sentinelNode.Right = sentinelNode;
            sentinelNode.Parent = null;
            sentinelNode.Color = OrderedTreeNode.BLACK;
            rbTree = sentinelNode;
            lastNodeFound = sentinelNode;
        }