Is the new System.Runtime.Caching.MemoryCache class per session or per application?

I know System.Web.Caching.Cache is per application, is the new Syst开发者_如何学Cem.Runtime.Caching.MemoryCache class in .net 4.0 per session or per application?

Is there any way to do cache per session without using the session variable?

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Given that the new class is designed for .NET apps that not ASP.NET apps, that it would be per application.