Public Function BeginBuffer( _
   ByVal InSpatialReference As SpatialReference, _
   ByVal BufferSpatialReference As SpatialReference, _
   ByVal OutSpatialReference As SpatialReference, _
   ByVal Distances() As Double, _
   ByVal Unit As Unit, _
   ByVal UnionResults As Boolean, _
   ByVal InGeometryArray() As Geometry, _
   ByVal callback As AsyncCallback, _
   ByVal asyncState As Object _
) As IAsyncResult

Dim instance As GeometryServerProxy
Dim InSpatialReference As SpatialReference
Dim BufferSpatialReference As SpatialReference
Dim OutSpatialReference As SpatialReference
Dim Distances() As Double
Dim Unit As Unit
Dim UnionResults As Boolean
Dim InGeometryArray() As Geometry
Dim callback As AsyncCallback
Dim asyncState As Object
Dim value As IAsyncResult
 
value = instance.BeginBuffer(InSpatialReference, BufferSpatialReference, OutSpatialReference, Distances, Unit, UnionResults, InGeometryArray, callback, asyncState)

public IAsyncResult BeginBuffer( 
   SpatialReference InSpatialReference,
   SpatialReference BufferSpatialReference,
   SpatialReference OutSpatialReference,
   double[] Distances,
   Unit Unit,
   bool UnionResults,
   Geometry[] InGeometryArray,
   AsyncCallback callback,
   object asyncState
)