XML仍然为空

这可能是一个非常愚蠢的问题，但我似乎不能让这个东西工作。我正在尝试使用以下结构形成XML，并且能够在任何时间点向其中添加额外的数据，以及读取数据。现在我得到的是:

<?xml version="1.0" encoding="utf-8"?>
<sessions />

What I want

<?xml version="1.0" encoding="utf-8"?>
<sessions>
<session date="14.10.2016" time="17:15" amount="3">
<folder>C:''Users</folder>
<folder>C:''Test</folder>
<folder>C:''Asgbsf''Aleksei</folder>
</session>
<sessions />

My c# code

    static void Main(string[] args)
    {
        createXML();
        Console.WriteLine("Test XML");
        folderList.Add("C:''Users");
        folderList.Add("C:''Test");
        folderList.Add("C:''Asgbsf''Aleksei");
        XML();
        Console.ReadKey();
    }

    static List<String> folderList = new List<String>();

    private static string generateRandom(int min, int max)
    {
        Random rnd = new Random();
        return rnd.Next(min, max).ToString();
    }
    public static string pathToXml = "test_aleksei2.xml";
    public static void createXML()
    {
        XmlTextWriter textWritter = new XmlTextWriter(pathToXml,   Encoding.UTF8); //Creating file
        textWritter.WriteStartDocument(); //XML header
        textWritter.WriteStartElement("sessions"); //XML head
        textWritter.WriteEndElement(); //end writing element
        textWritter.Close(); //close XmlTextWriter 

    }

    public static void XML()
    {
        Console.WriteLine("XML function being executed");
        XmlDocument document = new XmlDocument(); //using XmlDocument to  Read
        document.Load(pathToXml); //loading XML
        XmlNode element = document.CreateElement("session"); //parent element

        XmlAttribute date = document.CreateAttribute("date"); //creating attribute
        date.Value = "14.10.2016"; 
        element.Attributes.Append(date); //append attribute to element 
        XmlAttribute time = document.CreateAttribute("time"); 
        time.Value = generateRandom(0, 23) + ":" + generateRandom(1, 59);
        element.Attributes.Append(time);
        XmlAttribute amount = document.CreateAttribute("amount");
        amount.Value = generateRandom(1, 10);
        element.Attributes.Append(amount);

        XmlNode folder = null;
        for (int i = 0; i < folderList.Count; i++)
        {
            Console.WriteLine(folderList[i]+" - " + i + "/" + folderList.Count);
            folder = document.CreateElement("Folder");
            folder.InnerText = folderList[i];
            element.AppendChild(folder);
        }

        document.Save(pathToXml);
     }

请帮帮我，我不明白我做错了什么。如果我只是c&p，我可能甚至不知道这里的问题是什么……提前谢谢大家

document.DocumentElement.AppendChild(element);