internal void PrintTree(Node MarkNode = null, int Level = 0, String Label = "L") { string Info = ""; if (this == MarkNode) { Info = " (mark)"; } Console.WriteLine( "{0}- {1}:{2}{3}", new String(' ', Level * 2), Label, this, Info ); if (LeftNode != null) { LeftNode.PrintTree(MarkNode, Level + 1, "L"); } if (RightNode != null) { RightNode.PrintTree(MarkNode, Level + 1, "R"); } }