Replacement CodeDOM providers that use the new .NET Compiler Platform ("Roslyn") compiler as a service APIs. This provides support for new language features in systems using CodeDOM (e.g. ASP.NET runtime compilation) as well as improving the compilation performance of these systems....
AntiXSS is an encoding library which uses a safe list approach to encoding. It provides Html, XML, Url, Form, LDAP, CSS, JScript and VBScript encoding methods to allow you to avoid Cross Site Scripting attacks. This library is part of the Microsoft SDL tools.
Validation attributes that can be used in any .NET 4.0 project to supplement the existing Data Annotations attributes.
If you are using MVC3 and also want client validation, use the DataAnnotationsExtensions.MVC3 package.
In .Net 4.6.2, asp.net enables plugin async SessionState module which is a good fit for the non-in-memory SessionState data store. This async SessionState module provides the extensibility to plugin an async version of SessionState provider.