AGSFeatureSet DisplayFieldName property is always null?

Discussion created by mcoop05 on Aug 12, 2013
Latest reply on Aug 13, 2013 by mcoop05
Am I assuming incorrectly that the AGSFeatureSet property "displayFieldName" should return the primary display field as set in the map service's source MXD?  I have it set in the MXD, can see it in the rest services directory but this property is always null.  Am I doing something wrong or attempting to use this field incorrectly?