' Show how to use LockAllElementsExcept. 
    ' It locks and unlocks all the MyUrls elements  
    ' except urls. 
    Shared Sub LockAllElementsExcept()

        Try 
            ' Get the current configuration file. 
            Dim config _
            As System.Configuration.Configuration = _
            ConfigurationManager.OpenExeConfiguration( _
            ConfigurationUserLevel.None)

            ' Get the MyUrls section. 
            Dim myUrlsSection As UrlsSection = _
            config.GetSection("MyUrls")

            If myUrlsSection Is Nothing Then
                Console.WriteLine("Failed to load UrlsSection.")
            Else 

                ' Get MyUrls section LockElements collection. 
                Dim lockElementsExcept _
                As ConfigurationLockCollection = _
                myUrlsSection.LockAllElementsExcept

                ' Get MyUrls section LockElements collection  
                ' enumerator. 
                Dim lockElementEnum As IEnumerator = _
                lockElementsExcept.GetEnumerator()

                ' Position the collection index.
                lockElementEnum.MoveNext()

                If lockElementsExcept.Contains("urls") Then 
                    ' Remove the lock on all the ther elements.
                    lockElementsExcept.Remove("urls")
                    ' Add the lock on all the other elements  
                    ' but urls element. 
                Else
                    lockElementsExcept.Add("urls")
                End If

                config.Save(ConfigurationSaveMode.Full)
            End If 
        Catch err As ConfigurationErrorsException
            Console.WriteLine("[LockAllElementsExcept: {0}]", _
            err.ToString())
        End Try 

    End Sub 'LockAllElementsExcept

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

    try
    {
        // Get the 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
        {

            // Get MyUrls section LockElements collection.
            ConfigurationLockCollection lockElementsExcept =
                myUrlsSection.LockAllElementsExcept;

            // Get MyUrls section LockElements collection  
            // enumerator.
            IEnumerator lockElementEnum =
                 lockElementsExcept.GetEnumerator();

            // Position the collection index.
            lockElementEnum.MoveNext();

            if (lockElementsExcept.Contains("urls"))
                // Remove the lock on all the ther elements.
                lockElementsExcept.Remove("urls");
            else 
                // Add the lock on all the other elements  
                // but urls element.
                lockElementsExcept.Add("urls");


            config.Save(ConfigurationSaveMode.Full);
        }
    }
    catch (ConfigurationErrorsException err)
    {
        Console.WriteLine("[LockAllElementsExcept: {0}]",
            err.ToString());
    }
}