OX => XX
XX => OX

XO => XX
XX => XO

        using (XmlReader reader = XmlReader.Create (@"DebugConfig.xml"))
        {
            while (reader.Read ())
            {
                // Only detect start elements.
                if (reader.IsStartElement ())
                {
                    Console.WriteLine ("Start <" + reader.Name + "> element.");
                    Config.Add (reader.Name, Convert.ToBoolean (reader ["value"]));
                }
            }
        }

<?xml version="1.0" encoding="utf-8" ?>
<pathfinding value="true"></pathfinding>

<?xml version="1.0" encoding="utf-8" ?>
<Debug>
	<general>true</general>
	<pathfinding>true</pathfinding>
</Debug>

[XmlRoot]
class Config
{
    [XmlElement]
    public Boolean Pathfinding;
}

// serializing
var xmlSerializer = new XmlSerializer(typeof(Config))
var config = new Config();
var stream = xmlSerailizer.Serialize(config);

// deserializing
var xmlSerializer = new XmlSerializer(typeof(Config));
var stream = ...
var config = (Config)xmlSerializer.Deserialize(stream);

[XmlRoot]
class Config
{
    public static Config FromFile(String path)
    {
        var xmlSerializer = new XmlSerializer(typeof(Config));
        using (var stream = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.Read))
        {
            return (Config)xmlSerializer.Deserialize(stream);
        }
    }

    public void ToFile(String path)
    {
        var xmlSerializer = new XmlSerializer(typeof(Config));
        using (var stream = File.Open(path, FileMode.Create, FileAccess.Write, FileShare.Write))

// loading
var config = Config.FromFile("config.xml");
// saving
config.ToFile("config.xml");