4.5. Security
In previous releases of .NET, the actions that code could perform could be controlled using Code Access Security (CAS) policies. Although CAS undoubtedly offered much flexibility, it could be confusing to use and didn't apply to unmanaged code. In .NET 4.0, security is much simpler.
4.5.1. Transparency Model
The transparency model divides code into safe, unsafe, and maybe safe code (depending on settings in the host the application is running in). .NET has a number of different types of hosts in which applications can live, such as ASP.NET, ClickOnce, SQL, Silverlight, and so on.
Prior to .NET 4.0, the transparency model was used mainly for auditing purposes (Microsoft refers to this as transparency level 1) and in conjunction ...
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