.NET Claim in three namespaces

Question

Now this is odd. After completing some research on claims based solutions in .NET, found that different authors refer to different classes in .NET namespace when actually speaki

Answer 1

System.IdentityModel.Claims is part of WCF/.Net 3.0

Microsoft.IdentityModel.Claims extends System.IdentityModel.Claims and is the Windows Identity Foundation class.

System.Security.Claims is the .Net 4.5 version.

So if you're writing using WIF, you should use Microsoft.IdentityModel.Claims.