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As you ve seen, you can transform any HTML element into a server control with the runat="server" attribute, and a page can contain an unlimited number of HTML controls. In addition to the controls you add, a web form can also contain a single HtmlHead control, which provides server-side access to the <head> tag. The control tree shown in the previous example doesn t include the HtmlHead control, because the runat="server" attribute hasn t been applied to the <head> tag. However, the Visual Studio default is to always make the <head> tag into a server-side control, in contrast to previous versions of ASP .NET. As with other server controls, you can use the HtmlHead control to programmatically change the content that s rendered in the <head> tag. The difference is that the <head> tag doesn t correspond to actual content you can see in the web page. Instead, it includes other details such as the title, metadata tags (useful for providing keywords to search engines), and stylesheet references. To change any of these details, you use one of a small set of members in the HtmlHead class. They include: Title: This is the title of the HTML page, which is usually displayed in the browser s title bar. You can modify this at runtime.

StyleSheet: This provides an IStyleSheet object that represents inline styles defined in the header. You can also use the IStyleSheet object to create new style rules dynamically, using its CreateStyleRule() and RegisterStyleRule() methods.

Controls: You can add or remove metadata tags programmatically using this collection and the HtmlMeta control class. Here's an example that sets title information and metadata tags dynamically: Page.Header.Title = "Dynamically Titled Page"; // Add metadata tags. HtmlMeta metaDescription = new HtmlMeta(); metaDescription.Name = "description"; metaDescription.Content = "A great website to learn .NET"; Page.Header.Controls.Add(metaDescription); HtmlMeta metaKeywords = new HtmlMeta(); metaKeywords.Name = "keywords"; metaKeywords.Content = ".NET, C#, ASP.NET"; Page.Header.Controls.Add(metaKeywords);

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Note also that this allows for more than one field to be registered on a given model. Since Django allows the same field to be used multiple times on a single model, supports that as well. If just one instance of the field was stored in the registry, the last one assigned to the model would overwrite the first, which could cause confusion about what s going on behind the scenes. By explicitly supporting multiple fields per model, we can avoid that problem entirely. The last step in the registration process is actually adding instances of to the registry when they re added to models. Remember from 3 that fields provide a method that executes while Django processes a model s contents. Overriding that method on gives access to the model class as well as the name it was given, but the registry is only interested in the model and field objects.

The HtmlHead control is handy in pages that are extremely dynamic. For example, if you build a data-driven website that serves promotional content from a database, you might want to change the keywords and title of the page depending on the content you use when the page is requested.

Using the Controls collection, you can create a control and add it to a page programmatically. Here s an example that generates a new button and adds it to a Panel control on the page: protected void Page_Load(object sender, System.EventArgs e) { // Create a new button object. Button newButton = new Button(); // Assign some text and an ID so you can retrieve it later. newButton.Text = "* Dynamic Button *"; newButton.ID = "newButton"; // Add the button to a Panel. Panel.Controls.Add(newButton); } You can execute this code in any event handler. However, because the page is already created, this code always adds the new control at the end of the collection. In this example, that means the new button will end up at the bottom of the Panel control. To get more control over where a dynamically added control is positioned, you can use a PlaceHolder. A PlaceHolder is a control that has no purpose except to house other controls. If you don t add any controls to the Controls collection of the PlaceHolder, it won t render anything in the final web page. However, Visual Studio gives a default representation that looks like an ordinary label at design time, so you can position it exactly where you want. That way, you can add a dynamic control between other controls. // Add the button to a PlaceHolder. PlaceHolder1.Controls.Add(newButton); When using dynamic controls, you must remember that they will exist only until the next postback. ASP .NET will not re-create a dynamically added control. If you need to re-create a control multiple times, you should perform the control creation in the Page.Load event handler. This has the additional benefit of allowing you to use view state with your dynamic control. Even though

View state and control state helps you keep track of your control s contents, but they re not enough for input controls. That s because input controls have an additional ability they allow users to

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