View difference between Paste ID: VgapJzMc and

-
+        sealed class MyDumper
         {
             private class Helper
             {
                 public Node Node;
                 public Helper Parent;
                 public string ParentIndent;
                 public bool Last;
             }
             public static string Dump(Node root)
             {
                 var sb = new StringBuilder();
                 var workStack = new Stack<Helper>();
                 var droot = new Helper {Parent = null, Node = root, ParentIndent = ""};
                 workStack.Push(droot);
                 while (workStack.Count > 0)
                 {
                     var current = workStack.Pop();
                     if (current.Parent != null)
                     {
                             sb.Append(current.Parent.ParentIndent);
                             current.ParentIndent = current.Parent.ParentIndent +
                                 (current.Last?" ":"│")+
                                 " ";
                         // my indent
                         sb.Append(current.Last ? "└" : "├");
                         sb.Append("-");
                     }
                     else current.ParentIndent = "";
                     sb.AppendLine(current.Node.Text);
                     for (int index = current.Node.Children.Count-1; index>=0; index--)
                     {
                         var node = current.Node.Children[index];
                         var dnode = new Helper {Node = node, Parent = current, Last = index==current.Node.Children.Count-1};
                         workStack.Push(dnode);
                     }
                 }
                 return sb.ToString();
             }
         }