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Private pLyrEvents As ILayerEvents_VisibilityChangedEventHandler
pLyrEvents = New ILayerEvents_VisibilityChangedEventHandler(AddressOf pLyrEvents_VisibilityChanged)
pLyrEvents = m_map.Layer(0)
AddHandler CType(m_map, ILayerEvents_Event).VisibilityChanged, pLyrEvents
 

private ILayerEvents_Event pLayerEvents;
        void mActiveViewEvents_ItemAdded(object Item)
        {
            if (Item is IFeatureLayer)
            {
                pLayerEvents = Item as ILayerEvents_Event;
                pLayerEvents.VisibilityChanged += new ILayerEvents_VisibilityChangedEventHandler(pLayerEvents_VisibilityChanged);
            }
        }

        void pLayerEvents_VisibilityChanged(bool currentState)
        {
            //do something here
        }