Markdig is a fast, powerful, CommonMark compliant, extensible Markdown processor for .NET. 

Features

• Very fast parser and html renderer (no-regexp), very lightweight in terms of GC pressure. See benchmarks
• Abstract Syntax Tree with precise source code location for syntax tree, useful when building a Markdown editor.
  • Checkout MarkdownEditor for Visual Studio powered by Markdig!
• Converter to HTML

Source: https://github.com/xoofx/markdig