C# MVC Oauth2.0 and WebApi Oauth Relation. Microsoft.Owin.Security.OAuth, MVC5.0+ How to Using? Web Mvc Sample Restore Packges. Navigation to the login page .Login system. * We can tag to the background code F9 debuging. Web Api Sample I Using AdvanceRestClient to Post request. * Then the request will be access the IdentityConfig file -ApplicationUserManager,F9 debuging.