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As mentioned earlier, forms authentication gives you control over the interface that users use to log into your web application. Along with its benefits, this approach also creates extra work, because you have to build the login page. Other forms of authentication supply some prebuilt portions. For instance, if you re using Windows authentication, the browser provides a standard dialog box. In Passport authentication, the user interface of the Passport site is always used for logging in. Creating the login page for forms authentication doesn t require a lot of work, though. It s just worth noting that forms authentication is merely a framework for building an authentication system, rather than an all-in-one system that s complete and ready to use. The new Membership API, on the other hand, includes a prebuilt login control that can be used either on a separate login page or within any page of your application that provides a prebuilt login user interface. This user interface is customizable and communicates with the Membership API to log the user in automatically. The control does most of the work of creating custom login pages. In most cases, creating a custom login page requires nothing more than adding an .aspx page to your solution with a login control on it. You don t need to catch any events or write any code if you are fine with the default behavior of the control (which will usually be the case). You will learn more details about this control in 21.

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.

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The maximum number of connections allowed in the pool (defaults to 100). If the maximum pool size has been reached, any further attempts to open a connection are queued until a connection becomes available. (An error is raised if the Connection.Timeout value elapses before a connection becomes available.) The minimum number of connections always retained in the pool (defaults to 0). This number of connections will be created when the first connection is opened, leading to a minor delay for the first request. When true (the default), the connection is drawn from the appropriate pool or, if necessary, is created and added to the appropriate pool. Specifies a time interval in seconds. If a connection is returned to the pool and its creation time is older than the specified lifetime, it will be destroyed. The default is 0, which disables this behavior. This feature is useful when you want to recycle a large number of connections at once.

When you use forms authentication, you are responsible for maintaining the details of the users who access your system. The most important details are the credentials that the user needs in order to log into the system. Not only do you need to devise a way to store them, but you also need to ensure that they are stored securely. Also, you need to provide some sort of administration tools for managing the users stored in your custom store. The Membership API framework ships with a prebuilt schema for storing credentials in a SQL Server database. So, you can save lots of time using this existing schema; furthermore, the schema is extensible. Still, you are responsible for backing up the credentials store securely so that you can restore it in case of a system failure. All these considerations don t apply to most other types of authentication. In Windows authentication, user credentials are stored by the underlying operating system. Windows uses a variety of techniques to keep them secure automatically so that you don t need to perform any work of your own. In Passport authentication, the credentials are stored securely on Passport servers.

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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