private void EditAppConfig(string type)
        {
            string scPath = AppDomain.CurrentDomain.BaseDirectory  ;

            XmlDocument xmlDoc=new XmlDocument();
              xmlDoc.Load(scPath);
            XmlNode root = xmlDoc.DocumentElement;
            XmlNodeList xmlNodes = root.SelectNodes("appSettings/add");
            XmlNode nodeConnectionString = xmlNodes[0];
            XmlNode nodeServerIP = xmlNodes[1];
            if (type.ToLower() != "")
            {
              XmlNode nodeAutoUpdate = xmlNodes[4];
                string check = Convert.ToString(autoCheck.Checked);
              nodeAutoUpdate.Attributes["value"].InnerText = check;
            }
            nodeConnectionString.Attributes["value"].InnerText = connStr;
            xmlDoc.Save(scPath);
      }