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The Login control is a composite control that solves the most common task for forms authentication based applications displaying a user name and password textbox with a login button. Furthermore, if events are caught through custom event procedures, it automatically validates the user against the default membership provider. The login status is a simple control that validates the authentication state of the current session. If the user is not authenticated, it offers a login button that redirects to the configured login page. Otherwise, it displays a sign-out button for the possibility of logging off. This is really a powerful control that allows you to display different sets of controls for authenticated and unauthenticated users. Furthermore, it allows you to display different controls for users who are in different roles, as you will see in 23. This allows the user to retrieve the password if the user has provided an e-mail address during registration. It requests the user name from the user and then automatically displays a user interface that displays the password question and requests the appropriate answer from the user. If the answer is correct, it uses the membership API to send the password to the user. This control is a composite control that requests the old password from the user and lets the user enter a new password including the password confirmation. Includes a complete wizard that guides the user (or an administrator) through the creation process of a user.

Because forms authentication is implemented entirely within ASP .NET, you have complete control over how authentication is performed. You don t need to rely on any external systems, as you do with Windows or Passport authentication. You can customize the behavior of forms authentication to suit your needs, as you will see in the section Persistent Cookies in Forms Authentication.

Summary

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You can use these controls with any other control. For example, you can use the Login control either on your main page or on a separate login page. Every control works in the same way: if you don t catch any custom events, all these controls work with the membership API by default. As soon as you catch events provided by the controls, you are responsible for completing the task. For example, the Login control supports an Authenticate event. If you don t catch this event, it uses the membership API automatically. But if you catch this event, you are responsible for validating user credentials on your own.

You have the same degree of control over the appearance of forms authentication as you do over its functionality. In other words, you can format the login form in any way you like. This flexibility in appearance is not available in the other authentication methods. Windows authentication needs the browser to collect credentials, and Passport authentication requires that users leave your website and visit the Passport site to enter their credentials.

In this chapter, you learned how to use forms authentication to implement authentication systems that simplify life and provide a great deal of flexibility. You also learned how to protect passwords and how you can use any data source for credential storage. In the next chapter, you ll learn about the new features that are built on top of forms authentication and that make it even easier to create login pages and deal with user authentication without writing all the code yourself.

The Login control provides you with a ready-to-use user interface that queries the user name and password from the user and offers a login button for actually logging the user in. Figure 21-12 shows an example of the Login control in action.

Forms authentication uses standard HTML as its user interface, so all browsers can handle it. Because you can format the login form in any way you like, you can even use forms authentication with browsers that do not use HTML, such as those on mobile devices. To do this, you need to detect the browser being used and provide a form in the correct format for the device (such as WML for mobile phones).

n one hand, forms authentication solves the critical fundamentals for implementing secure, custom login forms for your ASP.NET applications. On the other hand, the tasks you have to accomplish for implementing the login forms and communicating with the underlying credential store are almost always the same for every web application, and they re tedious. You should keep in mind one more point: forms authentication provides the infrastructure for authenticating users only. If you are using a custom credentials store, you have to write administration applications for managing users. That s what the ASP.NET team received as feedback from the developer community. Therefore, the team has added the new Membership API to ASP.NET 2.0; the Membership API is a framework based on top of the existing forms authentication infrastructure. When using the Membership API, you even don t need to implement login pages or credential storage. In this chapter, you will learn about the details of the Membership API.

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