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There is a "hidden" code generation feature in Visual Studio 2008 called Text Templating Transformation Toolkit or T4. It was added to VS2008 to help support Microsoft's Software Factory and DSL strategies.

The Basics:
Your add a .tt file to your project. You use VB.NET or C# to write code that generates any text output - .cs, .vb, .xml, .sql, .html, .xsd, .js, etc...
The templating syntax is similar enough to JSP or ASP.NET. This is an excellent way to bring code generation directly into your IDE.

More Info:
How Do I: Create And Use T4 Templates Video
Nice simple examples by Oleg Sych
The Clarius Add-in for Syntax Highlighting
Domain-Specific Language Tools at MSDN