public static void Save(LoggerConfig loggerConig, string xmlFilePath = null) {
if (xmlFilePath == null) {
xmlFilePath = c_xmlFilePath;
}
var doc = new XmlDocument();
using (var w = new XmlTextWriter(xmlFilePath, Encoding.UTF8)) {
w.Formatting = Formatting.Indented;
var ns = new XmlSerializerNamespaces();
ns.Add("", "");
loggerConig.Serialize(ns).WriteTo(w);
}
}