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The FinishButtonClick, NextButtonClick, PreviousButtonClick, and SideBarButtonClick events are cancellable. That means that you can use code like this to prevent the requested navigation action from taking place: protected void Wizard1_NextButtonClick(object sender, WizardNavigationEventArgs e) { // Perform some sort of check. if (e.NextStepIndex == 1 && txtName.Text == "") { // Cancel navigation and display a message elsewhere on the page. e.Cancel = true; lblInfo.Text = "You cannot move to the next step until you supply your name."; } } Here the code checks if the user is trying to move to step 1 using the NextStepIndex property. (Alternatively, you could examine the current step using the CurrentStepIndex property.) If so, the code then checks a text box and cancels the navigation if it doesn t contain any text, keeping the user on the current step. Writing this sort of logic gets a little tricky, because you need to keep in mind that step-to-step navigation can be performed in several ways. To simplify your life, you can write one event handler that deals with the NextButtonClick, PreviousButtonClick, and SideBarButtonClick events, and performs the same check. You saw this technique in 5 with the GreetingCardMaker.

s Note You can also use the ASP.NET validation controls in a Wizard without any problem. If the validation

Listing 13-2 shows the script that loads the report XML into a MySQL database. You ll need Active Record and Hpricot (introduced in 6) installed to use this script. You can install Hpricot with the following command:

controls detect invalid data, they will prevent the user from clicking any of the sidebar links (to jump to another step) and they will prevent the user from continuing by clicking the Next button. However, by default the Previous button has its CausesValidation property set to false, which means the user will be allowed to step back to the previous step.

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Writing database access code is hard. Some estimates say that up to 80 percent of the time spent on a project is spent on building the data access layer. That s an awful large amount of time. To help mitigate some of that cost, why not split up to the work so that one team works on the data access layer and others work on the web and service layers To make such an arrangement work, the web and service layers still need to interact with some implementation of the data access layer. By writing a DAO implementation that uses hard-coded values, the web and service layers can be developed while the full-blown DAO implementation is being built.

This chapter showed you how the rich Calendar, AdRotator, MultiView, and Wizard controls can go far beyond the limitations of ordinary HTML elements. When you re working with these controls, you don t need to think about HTML at all. Instead, you can focus on the object model that s defined by the control. Throughout this book, you ll consider some more examples of rich controls and learn how to use them to create rich web applications that are a world apart from HTML basics. Some of the most exciting rich controls that are still ahead include the navigation controls ( 14), the data controls ( 17), and the security controls ( 21).

You ll also need MySQL installed and a blank database named text_ad_report set up. You can create this database with the following command:

s You might also be interested in adding third-party controls to your websites. The Internet contains Tip

many hubs for control sharing. One such location is Microsoft s own www.asp.net, which provides a control gallery where developers can submit their own ASP.NET web controls. Some of these controls are free (at least in a limited version), and others require a purchase.

Listing 13-2. Google AdWords Database Loader (google_adwords_loader.rb)

Remember that one of the key benefits to using the Spring framework is that the cost of programming to interfaces rather than concrete classes is reduced to nearly zero. Like the data access layer you just saw, the service layer will be written as both a generic interface and a concrete class that implements the interface. Listing 7-13 shows the source code for the ProductService interface.

n this chapter, you ll consider two ways to extend your web pages another notch. First, you ll tackle user controls, which give you an efficient way to reuse a block of user interface markup and the code that goes with it. User controls are a key tool for building modular web applications. They can also help you create consistent website designs and reuse your hard work. Next, you ll explore custom drawing with GDI+. You ll see how you can paint exactly the image you need on request. You ll also learn the best way to incorporate these images into your web pages.

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