Public Function BeginGetDistance( _
   ByVal SpatialReference As SpatialReference, _
   ByVal G1 As Geometry, _
   ByVal G2 As Geometry, _
   ByVal DistanceUnit As LinearUnit, _
   ByVal callback As AsyncCallback, _
   ByVal asyncState As Object _
) As IAsyncResult

Dim instance As GeometryServerProxy
Dim SpatialReference As SpatialReference
Dim G1 As Geometry
Dim G2 As Geometry
Dim DistanceUnit As LinearUnit
Dim callback As AsyncCallback
Dim asyncState As Object
Dim value As IAsyncResult
 
value = instance.BeginGetDistance(SpatialReference, G1, G2, DistanceUnit, callback, asyncState)

public IAsyncResult BeginGetDistance( 
   SpatialReference SpatialReference,
   Geometry G1,
   Geometry G2,
   LinearUnit DistanceUnit,
   AsyncCallback callback,
   object asyncState
)