The tight integration with Visual Studio allows you to fully manage template execution right from Visual Studio! This means you can maintain a high Code Generation presence right within Visual Studio and not have to switch applications to run code generation.

CodeSmith integration for template execution within Visual Studio is a
first class concept with support for CodeSmith Project
Integration, Generate OnBuild features, MS-Build Integration, and drag
and drop templates onto the code surface. We will demonstrate many ways that CodeSmith can save you time while working inside Visual Studio.

http://docs.codesmithtools.com/display/Generator/Visual+Studio+Integration

If you
would like to download the video, please download the flash file attached to this post.