Public Sub GetVisibleScale( _
   ByVal layerID As String, _
   ByRef minScale As Double, _
   ByRef maxScale As Double _
) 

Dim instance As ImageMapFunctionality
Dim layerID As String
Dim minScale As Double
Dim maxScale As Double
 
instance.GetVisibleScale(layerID, minScale, maxScale)

public void GetVisibleScale( 
   string layerID,
   out double minScale,
   out double maxScale
)