How Can I Capture The Id Columne From A New Datarow?

In my BLL I have a method that adds a new row to a table in the database...

[System.ComponentModel.DataObjectMethodAttribute(System.ComponentModel.DataObjectMethodType.Insert, true)]
    public bool AddContact(string firstname, string lastname, string middleinit, bool active, Guid uid, bool newsletter)
    {
        ContactsDAL.tblContactsDataTable contacts = new ContactsDAL.tblContactsDataTable();
        ContactsDAL.tblContactsRow contact = contacts.NewtblContactsRow();

        contact.FirstName = firstname;
        contact.LastName = lastname;
        contact.MiddleName = middleinit;
        contact.Active = active;
        contact.UserID = uid;
        contact.Newletter = newsletter;

        contacts.AddtblContactsRow(contact);
        int rowsAffected = Adapter.Update(contact);

        return rowsAffected == 1;
    }

The primary key in this table is a BigInt set as an identity column....How do I capture the value of the primary key that gets created when the new row is added?