Public Function BeginGetLengths( _
   ByVal SpatialReference As SpatialReference, _
   ByVal InPolylineArray() As Polyline, _
   ByVal callback As AsyncCallback, _
   ByVal asyncState As Object _
) As IAsyncResult

Dim instance As GeometryServerProxy
Dim SpatialReference As SpatialReference
Dim InPolylineArray() As Polyline
Dim callback As AsyncCallback
Dim asyncState As Object
Dim value As IAsyncResult
 
value = instance.BeginGetLengths(SpatialReference, InPolylineArray, callback, asyncState)

public IAsyncResult BeginGetLengths( 
   SpatialReference SpatialReference,
   Polyline[] InPolylineArray,
   AsyncCallback callback,
   object asyncState
)