WatiN
Welcome at the WatiN (pronounced as What-in) website. Inspired by Watir development of WatiN started in December 2005 to make a similar kind of Web Application Testing possible for the .Net languages. Since then WatiN has grown into an easy to use, feature rich and stable framework. WatiN is developed in C# and aims to bring you an easy way to automate tests with Internet Explorer.
WatiN Feature List
* Automates all major HTML elements
* Find elements by multiple attributes
* Supports AJAX website testing
* Supports frames (cross domain) and iframes
* Supports popup dialogs like alert, confirm, login etc..
* Supports HTML dialogs (modal and modeless)
* A basic (extensible) logging mechanism
* Works with Internet Explorer 6 and Internet Explorer 7
* Developed in C#
* Licensed under the Apache License 2.0
* And.. If you miss some feature, you can add it yourself because it is open source!
Go to http://watin.sourceforge.net/
See also these related projects.