Using union in c#

Type rType = rte.Waypoints.GetType();
ArrayList al = new ArrayList(System.Array.CreateInstance(rType,rte.Wa ypoints.Count));
mpMap.ActiveMap.Union((object)al.ToArray(typeof(Ma pPoint.Waypoint))).GoTo();

rte = my active route i created.

I tried everything passing the waypoints collection, creating an array, but it tells me the parameter is incorrect.

I'm using MapPoint 2002 control.
The specs say Map.Location Union( object ArrayOfLocations )

How to make this work?

thanks,
nick :?: