Convert MongoDb Json to Xml in C#

Recently I needed to convert the Json files generated by mongoexport from a MongoDb database to XML so I can analyse the data in Excel. I used Json.NET and the following code to do that.

        static XmlNode ConvertToXmlNode(string json, string nodeName)
        {
            return JsonConvert.DeserializeXmlNode(json, nodeName);
        }

        static void Main(string[] args)
        {
            if (args.Length != 2)
            {
                Console.WriteLine("Usage: convert <path> <filename>");
                Console.WriteLine("No extensions needed. Uses .json for import and .xml for export");
                return;
            }

            string path = args[0];
            string filename = Path.Combine(path, args[1] + ".json");
            string dest = Path.Combine(path, args[1] + ".xml");
            string nodeName = args[1].ToLower();

            Console.WriteLine("Loading " + filename + " and converting to " + dest);
            string[] lines = File.ReadAllLines(filename);
            Console.WriteLine("Loaded " + lines.Length + " lines");

            XmlDocument doc = new XmlDocument();
            XmlElement root = doc.CreateElement("root");
            foreach (var line in lines)
            {
                var imported = doc.ImportNode(ConvertToXmlNode(line, nodeName).FirstChild, true);
                root.AppendChild(imported);
            }

            doc.AppendChild(root);

            doc.Save(dest);

            Console.WriteLine("Done");
            Console.ReadLine();
        }