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The second feature exposed by a server control is a collection of object methods. Functionality implemented using methods typically goes beyond the features of a property s set or get method; they usually perform a more complex action against the control. One of the best examples in ASP.NET of using methods for a server control is the data-binding process that links a control with a data source. In the Hello, World web form example, the Page_Load event checks to see if the page is requested via a form postback or if it was called for the first time using HTTP GET so that the page can generate the initial HTML for the browser, creating the option list. In the postback scenario, the code to create the option list is not necessary for the DropDownList control via the LoadDropDownList() method, because the server control DropDownList1 maintains its internal option list via the web form ViewState mechanism for subsequent postback operations to the server. We cover ViewState extensively in 3. The page s LoadDropDownList() method s first task is to create an ArrayList collection and load it with the string values Hello and Goodbye . It also links the ArrayList to the DropDownList by setting the DataSource property to the ArrayList: private void LoadDropDownList() { ArrayList list = new ArrayList(); list.Add("Hello"); list.Add("Goodbye"); Greeting.DataSource = list; } Note that we do not call the DataBind() method directly for DropDownList. Instead, we call the DataBind() method on the Page_Load handler itself. The DataBind() method of the Page class recursively calls the DataBind() methods for all its child controls that have references to a data source. In this case, when the Page class s DataBind() method is invoked, the DropDownList control data binds to the ArrayList object as shown previously.

<br /> Thank you for completing this survey.<br /> Your products will be delivered shortly.<br /> </asp:WizardStep> </WizardSteps> </asp:Wizard> Figure 16-5 shows the wizard steps.

The FormsAuthentication module has a bit more work to do because it disregards the token it receives from IIS (ASPNET always receives a token from IIS) Forms Authentication bases a user s authentication status on the presence of a valid authentication ticket contained within a cookie or URL So the FormsAuthentication module checks for the authentication ticket in the authentication cookie (normally, ASPXAUTH) and the URL If no ticket is found, or the ticket is found but is invalid or expired, then the module loads anonymous user information (blank username) into the User property of the Context object and denotes that the user.

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Figure 16-5. A wizard with four steps Unlike the MultiView control, you can see only one step at a time in Visual Studio. To choose which step you re currently designing, select it from the smart tag, as shown in Figure 16-6. But be warned every time you do, Visual Studio changes the Wizard.ActiveStepIndex property to the step you choose. Make sure you set this back to 0 before you run your application so it starts at the first step.

Remember, when you add controls to separate steps on a wizard, they are all instantiated and persisted in view state, regardless of the current step. If you need to slim down a complex wizard, you ll need to split it into separate pages, use the Server.Transfer() method to move from one page to the next, and tolerate a less elegant programming model.

HttpHandler objects deserve special attention, because ASP.NET uses this same architecture to process requests for .aspx and .asmx pages. HttpHandlers enable processing of individual HTTP URLs or groups of URL extensions within an application. Table 3-1 shows examples of the HttpHandlers provided in ASP.NET by default.

isn t authenticated. If the ticket is found, then the module loads the appropriate user information into the User property. Each authentication module is responsible for creating an IPrincipal object representing the authenticated account and placing it in the User property of the Context object. The Context object provides contextual information for a request, including user information, session data, request specifics, and so on. An IPrincipal object is an interface for defining principal objects in the .NET Framework. Various principal objects have varying degrees of functionality. Windows Authentication, for example, results in a System.Security. Principal.WindowsPrincipal object that exposes basic functionality for identifying an authenticated account and checking role information. Forms Authentication results in a System.Web.Security.RolePrincipal object capable of account identification, role checking, and additional functions geared toward storing authentication data in a cookie or URL. ASP.NET allows you to uses the IPrincipal object in the HttpContext for identity and role checking in ASP.NET, but access to outside resources is still dictated by the security context defined by the access token attached to the thread. In other words, ASP.NET authentication has no effect on the security context of the thread. The resulting IPrincipal object from ASP.NET authentication is, however, used in URL authorization.

You can write the code that underpins your wizard by responding to several events (as listed in Table 16-3).

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