' Show how to use IsReadOnly. 
    ' It loops to see if the elements are read only.  
    Shared Sub ReadOnlyElements()
        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")

            Dim elements As UrlsCollection = _
            myUrlsSection.Urls

            Dim elemEnum As IEnumerator = _
            elements.GetEnumerator()

            Dim i As Integer = 0
            Console.WriteLine(elements.Count.ToString())

            While elemEnum.MoveNext()
                Console.WriteLine("The element {0} is read only: {1}", _
                elements(i).Name, elements(i).IsReadOnly().ToString())
                i += 1
            End While 
        Catch err As ConfigurationErrorsException
            Console.WriteLine("[ReadOnlyElements: {0}]", _
            err.ToString())
        End Try 

    End Sub 'ReadOnlyElements

// Show how to use IsReadOnly. 
// It loops to see if the elements are read only.  
static void ReadOnlyElements()
{
    try
    {
        // Get the configuration file.
        System.Configuration.Configuration config =
            ConfigurationManager.OpenExeConfiguration(
            ConfigurationUserLevel.None);

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


        UrlsCollection elements = myUrlsSection.Urls;


        IEnumerator elemEnum =
            elements.GetEnumerator();

        int i = 0;
        Console.WriteLine(elements.Count.ToString());

        while (elemEnum.MoveNext())
        {
            Console.WriteLine("The element {0} is read only: {1}",
             elements[i].Name,
             elements[i].IsReadOnly().ToString());
            i += 1;
        }
    }
    catch (ConfigurationErrorsException err)
    {
        Console.WriteLine("[ReadOnlyElements: {0}]",
            err.ToString());
    }

}