How to determine whether SqlConnection is enlisted into a System.Transactions' tx or not?

public static bool IsEnlisted(SqlConnection con)
    {
        object o = typeof(SqlConnection).GetField("_innerConnection", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(con);
        o = o.GetType().GetField("_enlistedTransaction", BindingFlags.Instance | BindingFlags.NonPublic);
        return o != null;
    }