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To get a better understanding of how master pages work under the hood, it s worth taking a look at a content page with tracing (add the Trace="True" attribute in the Page directive). That way you can study the control hierarchy. What you ll discover is that ASP .NET creates the control objects for the master page first, including the ContentPlaceHolder, which acts as a container. It then adds the controls from the content page into the ContentPlaceHolder.

ASP .NET is intelligent enough to catch if you try to use a skin name that doesn t exist, in which case you ll get a build warning. The control will then behave as though you set EnableTheming to false, which means it will ignore the corresponding default skin.

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So far you ve seen how you can add server controls to a page by registering the type of user control and adding the corresponding tag You can also create user controls dynamically in other words, create them on the fly using nothing but a little web-page code This technique is similar to the technique you used to add ordinary web controls dynamically (as described in 3) As with ordinary controls, you should do the following: Add user controls when the PageLoad event fires (so that your user control can properly restore its state and receive postback event) Use container controls and the PlaceHolder control to make sure the user controls end up exactly where you want Give the user control a unique name by settings its ID property You can use this information to retrieve a reference to the control when you need it with the Page.

The design-time representation of your content pages can range from excellent to poor. For the simple header and footer example, you ll see a fairly good representation of your content page that includes all the elements of the master page and the additional content you ve added. The parts you ve acquired from the master page will be shaded in gray, indicating you can t select or change them in any way. Instead, you ll be limited to inserting comments into the ContentPlaceHolder region, as shown in Figure 15-12.

The SkinID doesn t need to be unique. It just has to be unique for each control. For example, imagine you want to create an alternate set of skinned controls that use a slightly smaller font. These controls match your overall theme, but they re useful on pages that display a large amount of information. In this case, you can create new Button, TextBox, and Label controls and give each one the same skin name (such as Smaller).

FindControl() method This has one additional wrinkle You can t create a user control object directly, like you can with an ordinary control That s because user controls aren t entirely based on code they also require the control tags that are defined in the ascx file To use a user control, ASPNET needs to process this file and initialize the corresponding child control objects To perform this step, you need to call the PageLoadControl() method When you call LoadControl(), you pass the filename of the ascx user control markup file LoadControl() returns a UserControl object, which you can then add to the page and cast to the specific class type to access control-specific functionality Here s an example that loads the TimeDisplay user control dynamically and adds it to the page using a PlaceHolder control: TimeDisplay ctrl = (TimeDisplay)PageLoadControl("TimeDisplayascx"); PlaceHolder1Controls.

If a master page defines a ContentPlaceHolder but your content page doesn t define a corresponding Content control, you ll see a black box in its place. To add the required Content control, right-click that section of the page and choose Create Custom Content.

So far, the theme examples have applied relatively simple properties. However, you can create much more detailed control tags in your skin file. Most control properties support themes. If a property can t be declared in a theme, you ll receive a build error when you attempt to launch your application.

Add(ctrl); Despite this slightly awkward detail, dynamically loading is a powerful technique when used in conjunction with user controls It s commonly used to create highly configurable portal frameworks..

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