I have feature layer created by feature service. , the lables of layer are displayed In the mxd file. but not show on silverlight application as feature layer and only show as ArcGISDynamicMapServiceLayer. why? how to fix it?
I'm not sure I understand the question. What label are you talking about and where do you expect this to show on the FeatureLayer?
Can you explain using sampleserver? This is a FeatureService that can be used for FeatureLayer (http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/BloomfieldHillsMichigan/LandusePlanning/F...) This is the corresponding MapService that can be used in ArcGISDynamicMapServiceLayer (http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/BloomfieldHillsMichigan/LandusePlanning/M...)
I don't have access to the links you provided.