Microsoft Anti-Cross Site Scripting Library V4.2

Overview 
The Microsoft Anti-Cross Site Scripting Library V4.2 (AntiXSS V4.2) is an encoding library designed to help developers protect their ASP.NET web-based applications from XSS attacks. It differs from most encoding libraries in that it uses the white-listing technique — sometimes referred to as the principle of inclusions — to provide protection against XSS attacks. This approach works by first defining a valid or allowable set of characters, and encodes anything outside this set (invalid characters or potential attacks). The white-listing approach provides several advantages over other encoding schemes. 

System requirements 
Supported Operating Systems: Windows 7, Windows Server 2003, Windows Server 2008, Windows Vista, Windows XP Microsoft Windows running .NET Framework 2.0 or later

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Fuente: Cryptex