private void AddStaffPhone(StaffPhoneNumberDto staffPhoneDto, Staff staff)
        {
            var staffPhoneType = _mappingHelper.MapLookupField <StaffPhoneType> (staffPhoneDto.StaffPhoneType);
            var staffPhone     = new StaffPhone(
                staffPhoneType,
                new PhoneBuilder().WithPhoneNumber(staffPhoneDto.PhoneNumber).WithPhoneExtensionNumber(staffPhoneDto.PhoneExtensionNumber),
                false);

            staff.AddPhone(staffPhone);
        }
 private void ChangeStaffPhone(StaffPhoneNumberDto staffPhoneDto, Staff staff, StaffPhone staffPhone)
 {
     RemoveStaffPhone(staffPhoneDto, staff, staffPhone);
     AddStaffPhone(staffPhoneDto, staff);
 }
 private static void RemoveStaffPhone(StaffPhoneNumberDto staffPhoneDto, Staff staff, StaffPhone staffPhone)
 {
     staff.RemovePhone(staffPhone);
 }