Escaping CDATA

This is a handy code that wraps a string with CDATA escaping any CDATA inside it:

public static string CData(string data)
{
    if (string.IsNullOrEmpty(data))
    {
        return string.Empty;
    }

    string result = Regex.Replace(data, "]]>", "]]]]><![CDATA[>");
    return "<![CDATA[" + result + "]]>";
}

Update: Clarity