AspMap for .NET 4.0   
by VDS Technologies   

AspMap for .NET is a set of high-performance mapping controls for ASP.NET. AspMap gives you the ability to generate map images, drill-down capability, thematic mapping, point-to-point routing and other features that - generated on the server - will make the map images fully interactive on the client-side. AspMap can create images in any standard image file format, or even send a bit-stream directly to the browser. Whether you have a local government web site, a real estate web site or a vehicle tracking web site, or if you provide location-based services, AspMap can give you the functionality you need to turn the occasional visitor to your site into a regular user.