Sub DissolvePolygons()
  Dim pMxDoc As IMxDocument
  Dim pMap As IMap
  Dim pFeatureLayer As IFeatureLayer
  Dim pInFeatureClass As IFeatureClass
  Dim pOutFeatureClass As IFeatureClass
  
  Set pMxDoc = ThisDocument
  Set pMap = pMxDoc.FocusMap
  Set pFeatureLayer = pMxDoc.SelectedLayer
  Set pInFeatureClass = pFeatureLayer.FeatureClass
  '=======================================================================
  Dim ET As New ETGW_Core
  Dim sOutFileName As String
  Dim disFields(2) As String
  disFields(0) = "CNTY_FIPS"
  disFields(1) = "STATE_FIPS"
  sOutFileName = "c:\00\dissolve_polygons.shp"
  Set pOutFeatureClass = ET.DissolvePolygons(pInFeatureClass, sOutFileName, _
                                       disFields)
  '========================================================================
  Set pFeatureLayer = New FeatureLayer
  Set pFeatureLayer.FeatureClass = pOutFeatureClass
  pFeatureLayer.Name = pOutFeatureClass.AliasName
  pMap.AddLayer pFeatureLayer
End Sub