FeatureSet.DisplayFieldName is empty?

Discussion created by trevor_hart-eagle-co-nz-esridist on May 5, 2013
Using this service as a test;

When I do a select on the features the feature set it returned as expected. It contains the correct number of graphics but the DisplayFieldName method returns a null (or empty string).

Is this a bug?

The display field is definitely set on the feature service.