public void OnClickSave()
    {
        XElement tmproot = new XElement("root");

        //add current edit root
        m_TreeParser.GenXML(tmproot, m_Root);

        //check other content and check id
        Check(tmproot, m_Root.ID);

        //ready to save
        using (FileStream fs = new FileStream(m_strDataPath, FileMode.Create))
        {
            XmlWriterSettings setting = new XmlWriterSettings();
            setting.Indent       = true;
            setting.IndentChars  = "\t";
            setting.NewLineChars = "\n";
            setting.Encoding     = Encoding.UTF8;
            using (XmlWriter xw = XmlWriter.Create(fs, setting))
            {
                tmproot.WriteTo(xw);
            }
        }
    }