var book = new AddressBook (this) {
    PreferContactAggregation = true
};

foreach (Contact c in book.Where (c => c.LastName == "Smith")) {
    print (c.DisplayName);
    foreach (Phone p in c.Phones)
        print ("Phone: " + p.Number);
    foreach (Email e in c.Emails)
        print ("Email: " + e.Address);
}