Public Function BeginGetNALayerNames( _
   ByVal LayerType As esriNAServerLayerType, _
   ByVal callback As AsyncCallback, _
   ByVal asyncState As Object _
) As IAsyncResult

Dim instance As NAServerProxy
Dim LayerType As esriNAServerLayerType
Dim callback As AsyncCallback
Dim asyncState As Object
Dim value As IAsyncResult
 
value = instance.BeginGetNALayerNames(LayerType, callback, asyncState)

public IAsyncResult BeginGetNALayerNames( 
   esriNAServerLayerType LayerType,
   AsyncCallback callback,
   object asyncState
)