My Code:

public class Contact
{
    public string id{ get; set; }
    public string contact_type_id { get; set; }
    public string value{ get; set; }
    public string person_id { get; set; }
    public Contact()
    {

    }
}

public class Contact:Base.Contact
{
    public ContactType ContactType { get; set; }
    public Person Person {get; set;}
    public Contact()
    {
        ContactType = new ContactType();
        Person = new Person();
    }
}

And:

Contact c = new Contact();
Base.Contact cb = (Base.Contact)c;

The Problem:

The **cb** is set to **Contac** and not to **Base.Contact**.
Have any trick to do that????