public void FinishTrip()
        {
            if (ValidationErrorsHandler.IsValid(_validator, Trip))
            {
                _isFormValid = true;
                DataServiceTrip dsTrip = new DataServiceTrip();
                dsTrip.UpdateTrip(Trip);

            }
            else
            {
                _isFormValid = false;
            }
        }
 public void UpdateExistingTrip()
 {
     DataServiceTrip dsTrip = new DataServiceTrip();
     dsTrip.UpdateTrip(Trip);
 }