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avigation is a fundamental component of any website. ASP.NET 1.x had plenty of raw tools, but you were forced to cobble together your own navigation solutions. ASP.NET 2.0 addresses this gap by introducing a wide range of navigation features. In this chapter, you ll tackle three core topics: The MultiView and Wizard controls: These let you boil down a series of steps into a single page. The new site map model: This lets you define the navigation structure of your website and bind it directly to rich controls. You ll also learn how to extend this framework to support different types of controls and different site map storage locations. The rich navigational controls: These include the TreeView and Menu. Although these controls aren t limited to navigation, they re an ideal match. In this chapter, you ll learn about their wide range of features. Using these controls, the site map model, and master pages, you can build a complete navigation system with minimal effort. Best of all, ASP.NET cleanly separates the data (the information about the structure of your website) from its implementation (the navigational controls). That means you can reorganize, replace, and rename web pages without disturbing your website or editing any code. All you need to do is make the corresponding changes to your application s site map file.

If you re still curious, you can dig around in the c:\[WinDir]\Microsoft.NET\Framework\[Version]\Temporary ASP.NET Files directory to see the automatically generated classes shown in Figure 2-22.

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For the most part, HTML uses a flow-based layout. That means as more content is added, the page is reorganized and other content is bumped out the way. This layout can make it difficult to get the result you want with master pages. For example, if you aren t careful, you could craft the perfect layout, only to have the structure distorted by a huge block of information that s inserted into a <Content> tag. To control these problems, most master pages will use either HTML tables or CSS positioning to control the layout. With tables, the basic principle is to divide all or a portion of the page into columns and rows. You can then add a ContentPlaceHolder in a single cell, ensuring that the other content is aligned more or less the way you want. With CSS positioning, the idea is to separate your content into <div> tags and position these <div> tags by using absolute coordinates or by floating them on one side of the page. You ll then place the ContentPlaceHolder in the <div> tag.

The features discussed in this chapter are all new in ASP.NET 2.0. This means if you re a skilled ASP.NET 1.x developer, this is a chapter worth reading in detail.

So, why are all the control variables and methods declared as protected It s because of the way inheritance is used in this series of layers. Protected variables act like private variables with a key difference they are accessible to derived classes. In other words, using protected variables in your code-behind class (for example, HelloWorldPage) ensures that the variables are accessible in the derived page class (HelloWorldPage_aspx). This allows ASP .NET to match your control variables to the control tags and attach event handlers at runtime.

The following example shows how you can use master pages to create a traditional web application with a header, footer, and navigation bar, all of which are defined with tables. Figure 15-14 shows how this structure is broken up into a table.

Most websites split tasks across several pages. For example, if you want to add an item to your shopping cart and take it to the checkout in an e-commerce site, you ll need to jump from one page to another. This is the cleanest approach, and it s easy to program provided you use some sort of state management technique (from query strings to session state) to transfer information from one page to another. In other situations, you might want to embed the code for several different pages inside a single page. For example, you might want to provide several views of the same data (such as a grid-based view and a chart-based view) and allow the user to switch from one view to the other without leaving the page. Or, you might want to handle a small multistep task (such as supplying user information for an account sign-up process), without worrying about how to transfer the relevant information.

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