title: Azure Active Directory C#
body: <p>I have an application with my own user system that I built for my company.  We have azure active directory and I can not figure out how to use it for the life of me.</p>
  
  <p>I simply want to send a username and password and find out if they are the user they say they are according to AD.</p>
  
  <p>Where do I start?</p>