docopt.net is the .net version of the docopt python beautiful command line parser. docopt.net helps you define an interface for your command-line app, and automatically generate a parser for it. docopt.net is based on conventions that have been used for decades in help messages and man pages for program interface description. Interface description in docopt.net is such a help message, but formalized. Check out http://docopt.org for a more detailed explanation.
Quick example:
var arguments = new Docopt().Apply("Usage: prog [-a] [-b] FILE", args);
if (arguments["-a"].IsTrue) {{ ... }}