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In this exercise, you will improve the code from the previous exercise and utilize an SPQuery object to optimize the page. 1. Replace the code you added in step 5 of Exercise 14-2 with the following code: foreach (SPListItem categoryItem in categoryList.Items) { Panel p = new Panel(); p.CssClass = "empirenews-categorylist"; Label lb = new Label(); lb.CssClass = "empirenews-heading"; lb.Text = categoryItem.Title; p.Controls.Add(lb); SPQuery query = new SPQuery(); query.Query = @"<Where><Eq> <FieldRef Name=""ArticleCategory"" LookupId=""True"" /> <Value Type=""Lookup"">" + categoryItem.ID + "</Value></Eq></Where>"; foreach (SPListItem articleItem in web.Lists["News"].GetItems(query)) { LinkButton linkbutton = new LinkButton(); linkbutton.CssClass = "empirenews-articleitem"; linkbutton.Text = articleItem.Title; p.Controls.Add(linkbutton); } cp.Controls.Add(p); } The major changes here are that we now use an SPQuery object and design a CAML query to return only the relevant items from the news list. Since we get only the relevant items from the query, we have also simplified the foreach loop that iterates the news list.

Up to this point within the chapter, most, if not all, of the controls have mostly been used for displaying data or groups of data from a result set. The controls that can be grouped together within the Navigation controls do not have a main purpose of displaying data, but they give the end user an easy way to navigate from one web page to another from within the web application. 7 is dedicated to navigation and includes detailed examples of each of the controls. We briefly outline these controls here.

NET server controls will make you a highly productive web developer, with an intuitive feel for which controls should be used when This chapter aims to teach this proficiency by describing: How ASP .

Note Look at the FieldRef element of our query, and note that we add the LookupId="True" attribute.

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NET s HTML controls compare with HTML elements How to react to events fired by controls, on both the server side and the client side Different ways to change the appearance of controls, using attributes and stylesheets The advantages of web server controls, especially their design-time benefits and unified object model (common set of properties, methods, and events) How to make web-based data capture more reliable by using the validation controls How to create user controls and custom controls that expand on built-in functionality How to use dynamic content to generate user-aware web applications In this chapter, you ll have your first look at a sample application that you ll be returning to in each remaining chapter of this book The Friends Reunion application is a simplified take on a class of web sites that is currently quite popular.

Duration directive implementing output caching, 318 dynamic content web pages displaying, 162

The idea is to allow registered users to enter details of schools and colleges they ve attended or places they ve worked Then people who were at the same place at the same time are given the opportunity to contact one another As you progress, this application will become ever more complex, but you ll start here with some basics: a login form, registration form, and a page for general news items You will also work on some header and footer components, which are common in web applications..

This ensures that we query the Id part of the lookup value. If you do not care about the possibility of duplicate names in a lookup list, you can skip the LookupId attribute and just put the SPListItem.Title property in the Value element.

In the examples in 2, you had some experience with server controls: the Button and DropDownList controls. In this chapter, you ll soon discover that most of the other server controls at your disposal in VS .NET are just as easy to place and use. While a page is being designed, server controls appear as controls that you can configure through the Properties browser, changing their appearance, default values, and so on. At runtime, ASP .NET transforms them into plain old HTML code that it sends to the browser. Server controls offer real productivity gains over other methods of web page design, not only because of their ease of use, but also because they conform to the .NET programming model. They make the process of building a page as easy as designing a Windows Forms application. You drag controls onto your pages, tinker with their properties, and there s your user interface. You don t need to grapple with HTML unless, of course, you really want to. Once you get used to the new model, you may never want to mess with HTML source code again!

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