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Figure 19-2. Requesting a web page that requires authentication When a user requests a secure web page that allows only specific users or users in specific roles, the process is similar, but an extra step takes place (see Figure 19-3): 1. The request is sent to the web server. Since the user identity is not known at this time, the user is asked to log in (using a custom web page or a browser-based login dialog box). The specific details of the login process depend on the type of authentication you re using. 2. The user provides their credentials, which are verified with the application. This is the authentication stage. 3. The authenticated user s credentials or roles are compared to the list of allowed users or roles. If the user is in the list, then they are granted access to the resource; otherwise, access is denied. 4. Users who have access denied are either prompted to log in again, or they are redirected to a web page with an access denied message.

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.

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This information consists of the ID of the control that raised the event and any additional information that might be relevant These fields are initially empty, as shown here: <input type="hidden" name="__EVENTTARGET" value="" /> <input type="hidden" name="__EVENTARGUMENT" value="" /> The __doPostBack() function has the responsibility for setting these values with the appropriate information about the event and then submitting the form A sample __doPostBack() function is shown here: <script language="javascript"> <!-function __doPostBack(eventTarget, eventArgument) { var theform = documentForm1; theform__EVENTTARGETvalue = eventTarget; theform__EVENTARGUMENTvalue = eventArgument; theformsubmit(); } // --> </script> Remember, ASPNET generates the __doPostBack() function automatically This code grows lengthier as you add more AutoPostBack controls to your page, because the event data must be set for each control Finally, any control that has its AutoPostBack property set to true is connected to the __doPostBack() function using the onClick or onChange attribute.

One of the key goals of ASP.NET is to create a model that lets web developers rapidly develop web forms in the same way that Windows developers can build made-to-measure windows in a desktop application. Of course, web applications are very different from traditional rich client applications. There are two key stumbling blocks: Web applications execute on the server: For example, suppose you create a form that allows the user to select a product record and update its information. The user performs these tasks in the browser, but in order for you to perform the required operations (such as updating the database), your code needs to run on the web server. ASP .NET handles this divide with a technique called postback, which sends the page (and all user-supplied information) to the server when certain actions are performed. Once ASP .NET receives the page, it can then fire the corresponding server-side events to notify your code. Web applications are stateless: In other words, before the rendered HTML page is sent to the user, your web-page objects are destroyed and all client-specific information is discarded. This model lends itself well to highly scalable, heavily trafficked applications, but it makes it difficult to create a seamless user experience. ASP .NET includes several tools to help you bridge this gap; most notable is a persistence mechanism called view state, which automatically embeds information about the page in a hidden field in the rendered HTML. In the following sections, you ll learn about both the postback and the view state features. Together, these mechanisms help abstract the underlying HTML and HTTP details, allowing developers to work in terms of objects and events.

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