private long AddParkingLocation(string parkingLocationName, GPSCoordinates parkingLocationGPS, out string errorMessage)
{
long newId = -1;
// write to database (newId == -1 in case of error, so no additional error handling required)
DataAccessAdapter.AddParkingLocation(parkingLocationName, parkingLocationGPS, out newId, out errorMessage);
return(newId);
}
