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In this chapter, you explored the new navigation model and learned how to define site maps and bind the navigation data. You then considered three controls that are specifically designed for navigation data: the SiteMapPath, TreeView, and Menu. Using these controls, you can add remarkably rich site maps to your websites with very little coding. But before you begin, make sure you ve finalized the structure of your website. Only then will you be able to create the perfect site map and choose the best ways to present the site map information in the navigation controls.

Now, just bind two navigation controls In this case, one TreeView is linked to each SiteMapDataSource: Pages under the current page: <asp:TreeView ID="TreeView1" runat="server" DataSourceID="SiteMapDataSource1" /> <br /> The Information group of pages:<br /> <asp:TreeView ID="TreeView2" runat="server" DataSourceID="SiteMapDataSource2" /> Figure 14-6 shows the result as you navigate from defaultaspx down the tree to products1aspx The first TreeView shows the portion of the tree under the current page, and the second TreeView is always fixed on the Information group You ll need to get used to the SiteMapDataSourceStartingNodeOffset property It takes an integer that instructs the SiteMapDataSource to move that many levels down the tree (if the number is positive) or up the tree (if the number is negative) An important detail that s often misunderstood is that when the SiteMapDataSource moves down the tree, it moves toward the current node.

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When you want to place a menu item into this placeholder, from the context of a view script, you can simply capture some content, as shown in Listing 17-14. Listing 17-14. Capturing Output to a Placeholder (View Context) < php $this->placeholder('Zend_Layout') ->captureStart('APPEND', 'menu'); > <li><a href="...">New Menu Item</a></li> < php $this->placeholder('Zend_Layout')->captureEnd(); > This content will then be placed in the proper location in the document when the layout is rendered. This will allow you to create some advanced view effects that inject code into different sections of the document.

At the beginning of this book, you learned that ASP.NET is just one component in Microsoft s ambitious .NET platform. As you know, .NET also includes modern languages and a toolkit of classes that allows you to do everything from handling errors to analyzing XML documents. In this chapter, you ll explore another one of the many features in the .NET Framework: the ADO.NET data access model. Quite simply, ADO.NET is the technology that .NET applications use to interact with a database. In this chapter, you ll learn about ADO.NET and the family of objects that provides its functionality. You ll also learn how to put these objects to work by creating simple pages that retrieve and update database records. However, you won t learn about one of the most interesting ways to access a database using a code generation and data modeling tool called LINQ to Entities. Although LINQ to Entities is a powerful and practical way to generate a data model for your database, it may be overkill for your application, it may be unnecessarily complex, or it may not give you all the control you need (for example, if you want to perform unusual data tasks or implement elaborate performance-optimizing techniques). For these reasons, every ASP.NET developer should start by learning the ADO.NET fundamentals that are covered in this chapter.

If it s already at the current node, or your offset takes it beyond the current node, the SiteMapDataSource won t know where to go, and you ll end up with a blank navigation control To understand how this works, it helps to consider an example Imagine you re at this location in a website: Home > Products > Software > Custom > Contact Us If the SiteMapDataSource is starting at the Home node (the default) and you apply a StartingNodeOffset of 2, it will move down the tree two levels and bind to the tree of pages that starts at the Software node On the other hand, if you re currently at the Products node, you won t see anything That s because the starting node is Home, and the offset tries to move it down two levels However, you re only one level deep in the hierarchy.

Note The LINQ to Entities features is a higher-level model. That means it actually uses the ADO.NET classes

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