Injecting custom code into authentication and authorization in ASP.NET has always been tedious at best. AspNet. Identity is a library built to replace both ASP.NET Membership and Simple Membership. AspNet. Identity makes it much easier to implement custom authentication and authorization without the need to rewrite core components. In this session I will go deep into the abstractions that AspNet. Identity builds atop of, and show how to take advantage of these hook points to implement a custom membership system.