I have never done an openid application before. I did see that MVC 5 has some built in oauth sign ins. I was able to get these to work no problem, as they are already built.
Here is an excellent tutorial on how to integrate openid with ASP.NET MVC, and it do have working code, and instructions. Please have a look and get going.
http://weblogs.asp.net/haithamkhedre/archive/2011/03/13/openid-authentication-with-asp-net-mvc3-dotnetopenauth-and-openid-selector.aspx
Hope this helps.
Go to Tools > Library Package Manager > Package Manager Console and type:
Install-Package Owin.Security.Providers
Open your App_Start\Startup.Auth.cs, and add:
using Owin.Security.Providers.Steam;
Then, in the ConfigureAuth
method, add:
app.UseSteamAuthentication("your API key");
You can get an API key from http://steamcommunity.com/dev.
A "Steam" button should be added to your login page.