public void AddFolder(string name, string identifier, string url, string backend)
{
XmlNode node_name = CreateElement ("name");
XmlNode node_identifier = CreateElement ("identifier");
XmlNode node_url = CreateElement ("url");
XmlNode node_backend = CreateElement ("backend");
node_name.InnerText = name;
node_identifier.InnerText = identifier;
node_url.InnerText = url;
node_backend.InnerText = backend;
XmlNode node_folder = CreateNode (XmlNodeType.Element, "folder", null);
node_folder.AppendChild (node_name);
node_folder.AppendChild (node_identifier);
node_folder.AppendChild (node_url);
node_folder.AppendChild (node_backend);
XmlNode node_root = SelectSingleNode ("/sparkleshare");
node_root.AppendChild (node_folder);
Save ();
}