ASP.NET MVC 3: Using AppFabric Access Control Service to authenticate

I had Windows Azure training this week and I tried out how easy or hard it is to get Access Control Service to work with my ASP.NET MVC 3 application. It is easy now but it was not very easy to get there. In this posting I will describe you what I did to get ASP.NET MVC 3 web application to work with Access Control Service (ACS). I will show you also some code you may find useful.