ConfigurationElement.LockAttributes Property

// Show how to use LockAttributes. 
// It locks and unlocks all the urls elements. 
static void LockAttributes()
{

    try
    {
        // Get the current configuration file.
        System.Configuration.Configuration config =
            ConfigurationManager.OpenExeConfiguration(
            ConfigurationUserLevel.None);

        // Get the MyUrls section.
        UrlsSection myUrlsSection =
            config.GetSection("MyUrls") as UrlsSection;

        if (myUrlsSection == null)
            Console.WriteLine("Failed to load UrlsSection.");
        else
        {

            IEnumerator elemEnum =
                 myUrlsSection.Urls.GetEnumerator();

            int i = 0;
            while (elemEnum.MoveNext())
            {

                // Get the current element.
                ConfigurationElement element =
                    myUrlsSection.Urls[i];

                // Get the lock attributes collection of  
                // the current element.
                ConfigurationLockCollection lockAttributes =
                    element.LockAttributes;

                // Add or remove the lock on the attributes. 
                if (lockAttributes.Contains("name"))
                    lockAttributes.Remove("name");
                else
                    lockAttributes.Add("name");

                if (lockAttributes.Contains("url"))
                    lockAttributes.Remove("url");
                else
                    lockAttributes.Add("url");

                if (lockAttributes.Contains("port"))
                    lockAttributes.Remove("port");
                else
                    lockAttributes.Add("port");


                // Get the locket attributes. 
                string lockedAttributes =
                    lockAttributes.AttributeList;

                Console.WriteLine(
                    "Element {0} Locked attributes list: {1}",
                    i.ToString(), lockedAttributes);

                i += 1;

                config.Save(ConfigurationSaveMode.Full);

            }

        }
    }
    catch (ConfigurationErrorsException e)
    {
        Console.WriteLine("[LockAttributes: {0}]",
            e.ToString());
    }

}