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In this chapter, you looked into ASP .NET and the page life cycle. You learned how ASP .NET processes pages and how page forms and server-side controls can be mixed to improve your developer productivity and your users experience when accessing your application. You saw the differences between using ASP.NET HTML controls and ASP.NET server controls. You learned how maintaining page state can cause problems in scalability for applications, and how the ASP .NET view state functionality can give you a best-of-both-worlds approach state maintenance in your application without consuming server resources. You looked into how events can get stored and fired, and how they can be fired immediately using automatic postbacks. Finally, you reviewed the Page and Controls collections, looking into how you can use code to manage and manipulate controls on a page, or even dynamically add controls or dynamically change the status of your page at runtime. Our example was changing the page header in code. In the next chapter, you ll look at more application-specific code using data binding so that you can build real-world applications that provide user access to secured data stores.

In the previous examples, you used a TreeView to display data supplied by an XML data source control. ASP.NET also provides a Menu control that can be used to display hierarchical data. The Menu control closely matches the TreeView control with respect to XML data binding. However, it differs in its look and feel. The Menu control renders dynamic pull-down menus in your web forms similar to traditional Windows applications. Let s see an example of how it can be used. Create a new website in Visual Studio. Add the Navigation.xml file that you created previously to the website by using the Add Existing Item dialog box. Drag and drop an XmlDataSource control onto the default web form and set its DataFile property to Navigation.xml. Now drag and drop a Menu control onto the form and set its DataSourceID property to the ID of the XmlDataSource control you just configured. Now, locate the Menu control s DataBindings property. Similar to the TreeView, the Menu control opens the Menu DataBindings Editor, wherein you can configure the data bindings.

In this book, we use the open source search engine Lucene from the Jakarta Apache project to create a portlet for searching content in a Lucene index. Our Lucene

ost applications use some form of data store, with the application itself being a means to store, retrieve, manipulate, and view data. These applications might use a SQL Server 2005 database, a storage area network, or even a simple XML file. Web applications are no exception, and typically these applications are termed data-driven applications. When it comes to retrieving and representing data, a myriad of options are available; over time, the technology has evolved dramatically. The reason for this is that the code needed to access data and the engines that run the data itself tend to be resource heavy, and in situations such as on the Web where they may be used in clustered environments (i.e., the same application running on a number of machines) and serving millions of users, they can be expensive to maintain. As a result, the technology that developers use to create data-driven applications has evolved rapidly, driven by the needs of scaling to large audiences. .NET provides a data programming technology for you to use in your applications. It is called ADO.NET. It consists of a number of managed classes that enable your applications to connect to data sources, execute commands, and manage disconnected data. In this chapter, you ll look at the architecture of ADO.NET and how it works to bring data to your application. You ll look into the SQL Server 2005 Express edition, a free version of the industryleading enterprise database software from Microsoft, as well as a sample database, AdventureWorks, that is used to demonstrate many of its features. You ll wrap the chapter up with a tour through some of the server controls that can be used to provide data awareness to your web application through data binding.