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All principal objects implement the IPrincipal interface, which defines a core set of functionality. When you access the User property of the current web page (System.Web.UI.Page) or from the current HTTP context (HttpContext.Current), you re accessing an IPrincipal object that represents the security context of the current user. The IPrincipal interface defines a single property named Identity, which retrieves an IIdentity object that provides information about the current user. The IPrincipal interface also defines a single method named IsInRole(), which allows you to test whether the current user is a member of a specific role. Here s an example that uses the IsInRole() method to test whether the current user is a member of a role named Admin: if (HttpContext.Current.User.IsInRole("Admin")) { // (Do something.) } When using Windows authentication or forms authentication, the principal object is created automatically. However, it s also possible to create a principal object on the fly, with user and role information that you extract from another location, such as a custom database. You ll see examples of both techniques in later chapters.

Like the IPrincipal interface, the IIdentity interface provides consistency no matter what authentication scheme you use. All identity objects must implement IIdentity.

In addition to the standard site-wide and per-view caching options, it s also quite simple to use the cache directly, storing specific values so they can be retrieved later without having to perform expensive operations for data that doesn t change often. This low-level API is available in a generic form through the object, living at . Most of the usefulness of this object comes from three methods , and which work mostly how you d expect.

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The IIdentity interface defines the basic information needed to represent the current user. At a minimum, this includes the following three read-only properties: AuthenticationType: Returns the type of authentication used as a string (forms, Passport, NTLM, or a custom authentication type) IsAuthenticated: Returns a Boolean value that indicates whether the user has been authenticated (true) or is anonymous (false) Name: Returns the name of the current user as a string You can access the IIdentity object that represents the current user through the IIPrincipal object. Here s an example that uses this technique to check whether the user has been authenticated: if (HttpContext.Current.User.Identity.IsAuthenticated) { lblUserName.Text = HttpContext.Current.User.Identity.Name + " is logged in"; } The type of identity object depends on the type of authentication used. All in all, four identity classes are included in the .NET Framework: System.Web.Security.FormsIdentity: Represents a user who is logged on using forms authentication. System.Security.Principal.WindowsIdentity: Represents a Windows user account. System.Web.Security.PassportIdentity: Provides a class to be used by the PassportAuthenticationModule. System.Security.Principal.GenericIdentity: Represents a generic user identity. (You can use this to create identities if you re creating a custom authentication system.)

As you will see in 20, when using forms authentication, you need to authenticate your users against a custom store. This means you must do much more than create a basic login page for validating user names and passwords. Of course, you need a way to manage users as well as assign users to roles. With ASP.NET 1.x you had to create such management tools and components for programmatic management on your own. ASP.NET 2.0 provides this infrastructure through the Membership API, the Roles API, and the Profiles API.

The Membership API is a complete user management system. It helps you create, edit, and delete users, and it includes functionality for password recovery. You can use the API for programmatically performing all these management tasks, or you can use the ASP.NET web configuration tool for the graphical administration of your users. With this infrastructure you can save lots of time, as you don t have to create your own user administration application anymore because it already exists within the ASP.NET 2.0 framework. Furthermore, it includes functionality for validating a user name and password combination entered by the user. You will learn more details about the Membership API in 21.

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