>I have another question. The signature for the method is this
>
>

>static public string VerifyAddress( ref string AddressLine1, ref string AddressLine2, ref string City, ref string State, ref string ZipCode, ref string Country)

>
>So, although it may be not a good practice, my colleague (who wrote this method) returns new values using parameters passed by references. When I debug that DLL, I can see the new values, however, my call
>

I see Rick already replied, but normally if I have access to the underlying .NET source code I end up creating my own wrappers for things like this. For example, I'd create another VerifyAddress method (sorry, but yuck!) as:

public static Address VerifyAddress(Address address)
{
    // Code to verify address here
    // Create new Address class and populate properties, then return it.
}

public class Address
{
    public string AddressLine1 { get; set; }
    public string AddressLine2 { get; set; }
    public string City { get; set; }
    public string State { get; set }
    public string ZipCode { get; set; } 
    public string Result { get; set; }
}