NGeo.GeoNames.GeoNamesContainer.FindNearbyPostalCodes C# (CSharp) Method

        public ReadOnlyCollection<NearbyPostalCode> FindNearbyPostalCodes(NearbyPostalCodesFinder finder)
        {
            if (finder != null) finder.UserName = _userName;
            return _client.FindNearbyPostalCodes(finder);
        }

 public void GeoNames_FindNearbyPostalCodes_ShouldThrowException_WhenArgIsNull()
 {
     using (var geoNames = new GeoNamesContainer(null))
     {
         geoNames.FindNearbyPostalCodes(null);
     }
 }