Cloud-based Identity with Azure Access Control Service Configuring Access Control Service for an ASP.NET MVC 3 relying party In this recipe, we will create an ASP.NET MVC 3 application and integrate it with ACS. ACS can handle the authentication and the authorization for your website, but before it can do so you need to tell ACS a few things, which are essential for an out-of-band authentication that ACS enables. The main factors in this process are as follows: f f Your web application: It will act as the relying party application Client: It is a browser or an application that is attempting to gain access to your web application Identity provider: It is a site or a service that can authenticate the client (for example, Windows Live ID) ACS: The partition of ACS that is dedicated to your relying party application f f Getting ready The following are the prerequisites for ACS: f f .NET Framework 4.0 and Visual Studio 2010 (any edition above express). Windows Identity Foundation runtime, which can be downloaded from http://support.microsoft.com/?kbid=974405 . Windows Identity Foundation SDK, which can be downloaded from http://www. f