Download
Open source C# API for GeoIP City, Country, ISP, and more. Download
C# API with Visual Studio project file for GeoIP Country only. Download
Free GeoLite Country database. Download
A free geolocation database, GeoLite City, is also available.

Requirements
GeoIP C# API requires Microsoft .NET framework, or Mono on Linux and other Unix operating systems.

Credits
Thanks to Ting Huang for contributing the port of the Java API to C#.