public class Item
    {
        private XmlDocument doc = new XmlDocument();
        public string Code
        {
            get
            {
                return doc.SelectSingleNode("/item/code").InnerText;
            }
            set
            {
                doc.SelectSingleNode("/item/code").InnerText = value;
            }
        }
        public Item()
        {
            XmlElement itemElement = doc.CreateElement("item");
            doc.AppendChild(itemElement);
            XmlElement codeElement = doc.CreateElement("code");
            itemElement.AppendChild(codeElement);
        }
        public Item( string filename )
        {
            doc.Load(filename);
        }
        public void Save( string filename )
        {
            doc.Save(filename);
        }
    }