Building JSON object to send to an AJAX WebService

[WebMethod]
public Response ValidateAddress(Request request)
{
    return new test_AddressValidation().GenerateResponse(
        test_AddressValidation.ResponseType.Ambiguous);
}

...

public class Request
{
    public Address Address;
}

public class Address
{
    public string Address1;
    public string Address2;
    public string City;
    public string State;
    public string Zip;
    public AddressClassification AddressClassification;
}

public class AddressClassification
{
    public int Code;
    public string Description;
}