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Logging a user out of forms authentication is as simple as calling the FormsAuthentication.SignOut() method. You can create a logout button and add this code, as shown here: protected void SignOutAction_Click(object sender, EventArgs e) { FormsAuthentication.SignOut(); FormsAuthentication.RedirectToLoginPage(); } When you call the SignOut() method, you remove the authentication cookie. Depending on the application, you may want to redirect the user to another page when the user logs out. If the user requests another restricted page, the request will be redirected to the login page. You can also

Specifies whether the password question with an answer is required for this application. This question can be used if the user has forgotten his password. With the answer he gets the possibility of retrieving an automatically generated, new password via e-mail. Specifies whether e-mail addresses must be unique for every user in the underlying membership store.

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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.)

redirect to the login page immediately after calling the sign-out method. Or you can use the Response.Redirect method.

Now, after you have set up the data store and configured the membership provider, you can test your configuration by creating users through the WAT. The utility includes a link for testing the configuration by connecting to the database with the configured membership provider, as shown in Figure 21-9.

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.

To create new users in your previously created membership provider store, launch the WAT by selecting the Website ASP.NET Web Configuration menu from within Visual Studio. Now switch to the Security tab, and select Create User, as shown in Figure 21-10.

In a sophisticated application, your login page might not actually be a page at all. Instead, it might be a separate portion of the page either a distinct HTML frame or a separately coded user control. Using these techniques, you can keep a login and logout control visible on every page. The Membership API framework includes ready-to-use controls for providing this type of functionality.

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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