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view state is normally restored before the Page.Load event, if you create a control in the handler for the Page.Load event, ASP.NET will apply any view state information that it has after the Page.Load event handler ends. This process is automatic. If you want to interact with the control later, you should give it a unique ID. You can use this ID to retrieve the control from the Controls collection of its container. You could find the control using recursive searching logic, as demonstrated in the control tree example, or you can use the static Page.FindControl() method, which searches the entire page for the control with the ID you specify. Here s an example that searches for the dynamically added control with the FindControl() method and then removes it: protected void cmdRemove_Click(object sender, System.EventArgs e) { // Search for the button, no matter what level it's at. Button foundButton = (Button)Page.FindControl("newButton"); // Remove the button. if (foundButton != null) { foundButton.Parent.Controls.Remove(foundButton); } } Dynamically added controls can handle events. All you need to do is attach an event handler using delegate code. You must perform this task in your Page.Load event handler. As you learned earlier, all control-specific events are fired after the Page.Load event. If you wait any longer, the event handler will be connected after the event has already fired, and you won t be able to react to it any longer. // Attach an event handler to the Button.Click event. newButton.Click += new System.EventHandler(this.Button_Click); Figure 3-9 demonstrates all these concepts. It generates a dynamic button. When you click this button, the text in a label is modified. Two other buttons allow you to dynamically remove or re-create the button.

Figure 3-9. Handling an event from a dynamically added control Dynamic control creation is particularly powerful when you combine it with user controls (reusable blocks of user interface that can combine a group of controls and HTML). You ll learn more about user controls in 14.

Django will now call with the fully-prepared model once everything is in place to continue processing it. That method is then responsible for performing all of the remaining tasks, all the way through Step 3. Most of the details are delegated to other methods, but coordinates them. The first thing needs to do is copy the original model to create a new model with extra fields attached. It defers this task to the method, which in turn relies on a few other methods.

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Now that you ve explored the page life cycle and learned how a page contains controls, it s worth pointing out that the page itself is also instantiated as a type of control object. In fact, all web forms are actually instances of the ASP.NET Page class, which is found in the System.Web.UI namespace. You may have already figured this out by noticing that every code-behind class explicitly derives from System.Web.UI.Page. This means that every web form you create is equipped with an enormous amount of out-of-the-box functionality. The static FindControl() method and the IsPostBack property are two examples you ve seen so far. In addition, deriving from the Page class gives your code the following extremely useful properties: Session Application Cache Request Response Server User Trace Many of these properties correspond to intrinsic objects that you could use in classic ASP web pages. However, in classic ASP you accessed this functionality through built-in objects that were available at all times. In ASP.NET, each of these built-in objects actually corresponds to a Page property that exposes an instance of a full-featured class. The following sections introduce these objects.

The Session object is an instance of the System.Web.SessionState.HttpSessionState class. It s designed to store any type of user-specific data that needs to persist between web-page requests. The Session object provides dictionary-style access to a set of name/value pairs that represents the user s data for that session. Session state is often used to maintain things such as the user s name, the user s ID, a shopping cart, or various other elements that are discarded when a given user is no longer accessing pages on the website. The Application object is an instance of the System.Web.HttpApplicationState class. Like the Session object, it s also a name/value dictionary of data. However, this data is global to the entire application. Finally, the Cache object is an instance of the System.Web.Caching.Cache class. It also stores global information, but it provides a much more scalable storage mechanism because ASP.NET can remove objects if server memory becomes scarce. Like the other state collections, it s essentially a name/value collection of objects, but you can also set specialized expiration policies and dependencies for each item. Deciding how to implement state management is one of the key challenges of programming a web application. You ll learn much more about all these types of state management in 6.

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