SHFB

Those comments auto-build an XML output; it's a built-in feature of the C# compiler. [1] There are a number of XSLT stylesheets and more complicated tools around, many from relatively ancient times in the .NET world, to generate prettier documentation from those comments. NDoc [2] is ancient but still presumably works. I last used SandCastle, whose website proclaims it shutdown and forwards to fork SHFB [3], and some of whose guts inspired DocFX [4]. As another comment points out it appears that DocFX is the latest toolset Microsoft themselves are using (it's one of a couple of build tools for the new mostly all open source docs.microsoft.com site). [1] https://docs.microsoft.com/en-us/dotnet/csharp/programming-g... [2] http://ndoc.sourceforge.net/ [3] http://github.com/EWSoftware/SHFB [4] https://dotnet.github.io/docfx/