Public Function BeginExportMapImage( _
   ByVal MapDescription As MapDescription, _
   ByVal ImageDescription As ImageDescription, _
   ByVal callback As AsyncCallback, _
   ByVal asyncState As Object _
) As IAsyncResult

Dim instance As MapServerProxy
Dim MapDescription As MapDescription
Dim ImageDescription As ImageDescription
Dim callback As AsyncCallback
Dim asyncState As Object
Dim value As IAsyncResult
 
value = instance.BeginExportMapImage(MapDescription, ImageDescription, callback, asyncState)

public IAsyncResult BeginExportMapImage( 
   MapDescription MapDescription,
   ImageDescription ImageDescription,
   AsyncCallback callback,
   object asyncState
)