ISelection selection = m_hookHelper.FocusMap.FeatureSelection;
IEnumFeatureSetup iEnumFeatureSetup = selection as IEnumFeatureSetup;
iEnumFeatureSetup.AllFields = true;
IEnumFeature enumFeature = iEnumFeatureSetup as IEnumFeature;
enumFeature.Reset();
IFeature feature = enumFeature.Next();