public void UpdateEmailDB(ref Email email)
    {
        string UpdateTelefon = @"UPDATE telfeon
                    SET EmailAddress  = @email, PersonID = @PersonId
                    WHERE EmailID = @EmailID";

        using (SqlCommand cmd = new SqlCommand(UpdateTelefon, OpenConnection))
        {
            cmd.Parameters.AddWithValue("@email", email.EmailAddress);
            cmd.Parameters.AddWithValue("@PersonId", email.PersonID);

            var em = (int)cmd.ExecuteNonQuery();
        }
    }