/// <summary>
        /// 手动更新完成后,删除手动更新
        /// </summary>
        /// <param name="sn"></param>
        [WebMethod]
        public void DeleteHandUpdate(string sn)
        {
            string xmlpath = Server.MapPath("~/xml/UpdateInfo.xml");
            if (!File.Exists(xmlpath))
                return;
            XmlDocument xml = new XmlDocument();
            xml.Load(xmlpath);
            foreach (XmlNode node in xml.SelectSingleNode("UpdateInfo").ChildNodes)
            {
                if (node.InnerText == sn)
                {
                    xml.SelectSingleNode("UpdateInfo").RemoveChild(node);
                    break;
                }
            }
            xml.Save(xmlpath);
        }