Professional Visual Basic 2012 and .NET 4.5 Programming

The System.Security.Permissions Namespace

The System.Security.Permissions namespace is the namespace used in code to establish and use permissions associated with objects, including the file system, environment variables, and the registry. The namespace controls access to both operating-system-level objects as well as code objects. In order to use this namespace in your project, you need to import it. Using this namespace gives you access to the CodeAccessPermission and PrincipalPermission classes for using role-based permissions and information supplied by identity permissions. CodeAccessPermission controls access to the operating-system-level objects. Role-based permissions and identity permissions grant access to objects based on the identity of the user of the program that is running (the user context).

Table 18.2 lists the members of the System.Security.Permissions namespace that apply to Windows application programming. While there is a description accompanying each member, those classes that end with Attribute, such as EnvironmentPermissionAttribute, are classes that enable you to modify the security level at which your code is allowed to interact with each respective object. These objects create a declarative model for setting security that can be leveraged across multiple different implementation models.

Table 18.2 Members of System.Security.Permissions

Class	Description
CodeAccessSecurityAttribute	Base class for code access security attribute classes.
DataProtectionPermission ...