title: Ouath 2.0 with Asp.net Web Api 2 with only external login like google etc
body: <p>I am trying to implement Oauth 2.0 security integration with Asp.net web api 2 but only with external logins like google.I am pretty new for Oauth thing.</p>
  
  <p>Can any one suggest any good tutorial/ example with only external login.</p>
  
  <p>I do not want local user to register  etc.</p>