Make a path into a collapsible tree

FileSystemToTree.cs

using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace FileSystemToTree
{
	class Program
	{
		static void Main(string[] args)
		{
			var start = args[0];
			var node = PathToNodes(start);
			var html = Root(node);
			File.WriteAllText(node.Name + ".html", html, Encoding.UTF8);
		}

		static Node PathToNodes(string path)
		{
			var folder = new DirectoryInfo(path);
			var node = new Node { Name = folder.Name };
			var directories = folder.GetDirectories().Select(dir => PathToNodes(dir.FullName));
			var files = folder.GetFiles().Select(file => new Node { Name = file.Name });
			node.Children = directories.Concat(files);
			return node;
		}

		static string Root(Node node)
		{
			var builder = new StringBuilder();
			builder.AppendLine("<style>body{font-family:sans-serif;}</style>");
			builder.AppendLine("<script src='http://code.jquery.com/jquery-1.10.0.min.js'></script>");
			builder.AppendLine("<script src='http://code.jquery.com/jquery-migrate-1.2.1.min.js'></script>");
			builder.AppendLine("<script>");
			builder.AppendLine("$(function(){");
			builder.AppendLine("$('ul:not(#root)').hide();");
			builder.AppendLine("$('a').on('click',");
			builder.AppendLine("function(){");
			builder.AppendLine("var p=$(this).parent('p');");
			builder.AppendLine("var li=p.parent('li')");
			builder.AppendLine("li.find('>ul').toggle();");
			builder.AppendLine("return false;");
			builder.AppendLine("});");
			builder.AppendLine("});");
			builder.AppendLine("</script>");
			builder.AppendLine("<ul id='root'>");
			builder.AppendLine("<li>");
			builder.AppendLine(node.ToString());
			builder.AppendLine("</li></ul>");
			return builder.ToString();
		}
	}

	class Node
	{
		public string Name { get; set; }
		public IEnumerable<Node> Children { get; set; }
		public override string ToString()
		{
			var hasChildren = Children != null && Children.Any();
			var builder = new StringBuilder();
			builder.AppendLine("<p>");
			if (hasChildren)
			{
				builder.AppendLine("<a href='#'>");
			}
			builder.AppendLine(Name);
			{
				builder.AppendLine("</a>");
			}
			builder.AppendLine("</p>");
			if (hasChildren)
			{
				builder.AppendLine("<ul>");
				foreach (var node in Children)
				{
					builder.AppendLine("<li>");
					builder.AppendLine(node.ToString());
					builder.AppendLine("</li>");
				}
				builder.AppendLine("</ul>");
			}
			return builder.ToString();
		}
	}
}