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.
More:
Creating a Project with Sandcastle
Converting Doc-to-Help
Documenter for .NET projects to Doc-to-Help Sandcastle projects
CodeBlock and PostTransform components
D2HML hot spots in XML comments in source code
XSLT transformation of the source code
comments XML
Exclude elements without description
Special styles to easily create
links from narrative parts to the reference part
Source template
C1H_sandcastle_src.dot and the toolbar "Doc-To-Help -
Sandcastle"