Microsoft's Sandcastle utility automatically creates MSDN formatted reference documentation from .NET assemblies and XML comment files. This makes it possible for you to document a class library — plus add narrative information — quickly and efficiently. Doc-To-Help integrates Sandcastle's XML output into your projects, automatically creating topics, index, TOC, and other Help elements. With this information added to your project, you can edit/add your own topics, and easily link to namespaces.
With this plug-in you can generate any output from Sandcastle-generated content, automatically add reference sections to your documentation using Microsoft utilities, and enjoy automatic standard MSDN formatting.
Documenter for .NET is still included with Doc-To-Help if you have older projects you’d like to maintain.