Where in the world is WorkItemChangedEvent defined?

Problem: I am not asked to write TFS Event Handler web services very often and I can never remember where WorkItemChangedEvent is defined.  I spend more time searching for that missing reference than I do writing the code. Solution: For TFS 2010 WorkItemChangedEvent is in C:\Program Files\Microsoft Team Foundation Server 2010\Tools\Plugins\Microsoft.TeamFoundation.WorkItemTracking.Server.Dataaccesslayer.dll.

Demo Source Code

For those that wanted the demo code I presented today in the Web Cast it is here. It includes the code to databind a Coded UI Test. Thanks for joining me and I hope you enjoyed it. Demo.zip (408.41 kb)