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HTML frames: Frames are a basic tool of HTML that allow you to show more than one page in a browser window at once The key disadvantage of frames is that each page is retrieved through a separate request to the server, and as a result the code on each page must be completely independent That means a page in one frame can t communicate with or influence a page in another frame (at least not through server-side code) The one advantage that frames give that can t be duplicated by any other feature is isolated scrolling, which means each frame can be scrolled separately Master pages: Master pages are a new innovation in ASPNET that are designed specifically for standardizing web-page layout Master pages are web-page templates that can define fixed content and declare the portion of the web page where you can insert custom content.

In this chapter, you learned how to create some simple and some sophisticated user controls. You also saw how to load user controls dynamically and how to cache them. Though user controls are easy to create, they don t solve every custom control challenge. In fact, user controls are quite limited in scope (they can t be easily shared across applications), and they have limited design-time support (for example, you can t attach event handlers in the Properties window). User controls also lack advanced features and aren t well suited to rendering HTML and JavaScript on the fly. To improve on this situation, you can step up to custom controls, which are much more sophisticated and quite a bit more complicated to create. 27 describes custom controls.

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The problem shows up if you place the master page in a different directory from the content page that uses it This is a recommended best practice for large websites In fact, Microsoft encourages you to use a dedicated folder for storing all your master pages However, if you re not suitably careful, this can cause problems when you use relative paths For example, imagine you put a master page in a subfolder named MasterPages and add the following <img> tag to the master page: <img src="bannerjpg" /> Assuming the file \MasterPages\bannerjpg exists, this appears to work fine The image will even appear in the Visual Studio design environment However, if you create a content page in another subfolder, the path is interpreted relative to that folder If the file doesn t exist there, you ll get a broken link instead of your graphic.

If you use the same master page throughout your website, you re guaranteed to keep the same layout Best of all, if you change the master page definition after applying it, all the web pages that use it inherit the change automatically In ASPNET, master pages are the preferred option, and you ll see them at work throughout the rest of this chapter Frames offer a clumsier programming model but are required if you want to fix a portion of your page in place while allowing scrolling in another section If you want to learn more about frames, refer to 29 for the basics and for several ASP NET workarounds..

Although server controls are more powerful than user controls, most of the concepts you ve learned in this chapter apply to server controls in the same way that they apply to user controls. For example, you can create server controls that include properties and methods, use custom objects, fire events, and expose child controls.

Even worse, you could conceivably get the wrong graphic if another image has the same filename This problem occurs because the <img> tag is ordinary HTML As a result, ASPNET won t touch it Unfortunately, when ASPNET builds your content page, this tag is no longer appropriate To solve your problem, you could try to think ahead and write your URL relative to the content page where you want to use it But this creates confusion, limits where your master page can be used, and has the unwelcome side effect of displaying your master page incorrectly in the design environment Another quick fix is to make your image tag into a server-side control, in which case ASP NET will fix the mistake: <img src="bannerjpg" runat="server"/> This works because ASPNET uses this information to create an HtmlImage server control.

Many loyal ASP developers were surprised to find that ASP .NET 1.0 and 1.1 didn t include any facility for creating page templates a must for building a coherent site. Although some workarounds were proposed, these custom solutions still had drawbacks and often didn t integrate well with the Visual

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