I put together a quick screencast showing how to leverage T4 Templates in Visual Studio 2008 for Code Generation:

• T4 Templates in Visual Studio for Code Generation Screencast

I show step-by-step how to create a simple T4 Template and then how to generate various Entity, Data Access Object, and Factory Classes using more advanced T4 Templates that one might use to create a simple custom data access layer. I have seen other screencasts that have used SQL Server Management Objects, but in my case I use database schema related functionality in good 'ol ADO.NET. Although I wouldn't use this technique to build a data access layer given all the cool code generators and O/R Mappers, it is a pretty decent way to show the possibilities with T4 Templates.

I picked up a new iPhone 3G the other day and absolutely love it, so I also created a version of the screencast that you can download and play on the iPhone. In fact, several of the more recent Unity and Enterprise Library 4.0 Screencasts now have an iPhone version.

If you are interested in some of the ADO.NET techniques I used in the screencast to get database schema information, check out the show notes with links to various tutorials.

I hope the screencast is useful.