GMap.NET is a simple server control to allow easy implementation of google maps into any C# or VB.NET project without the use of any code and includes seamless integration with a .Kml file.

GMap.NET is great and Powerful, Free, cross platform, open source .NET control. Enable use routing, geocoding and maps from Google, Yahoo!, Bing, OpenStreetMap, ArcGIS, Pergo, SigPac, Yandex, Mapy.cz in Windows Forms & Presentation, supports caching and runs on windows mobile!