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Figure 10-8. Grouping controls for validation What happens if you add a new button that doesn t specify any validation group In this case, the button validates every control that isn t explicitly assigned to a named validation group. In the current example, no controls fit the requirement, so the page is posted back successfully and deemed to be valid. If you want to make sure a control is always validated, regardless of the validation group of the button that s clicked, you ll need to create multiple validators for the control, one for each group (and one with no validation group).

Note The GridView works exactly the same as the DetailsView when editing templates: you need to pick the Field you require, and then choose the template within that Field. The FormView is slightly different as it has no concept of Fields, so you can select only the template.

.NET s most practical features: validation. In this chapter, you learned how to use one of ASP You saw how ASP.NET combines server-side and client-side validation to ensure bulletproof security without sacrificing the usability of your web pages. You also looked at the types of validation provided by the various validation controls, and even brushed up on the powerful pattern-matching syntax used for regular expressions. Finally, you considered how to customize and extend the validation process to handle a few different scenarios.

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Listing 11-43 shows the two new lines we need to add to preDelete() in the BlogPost.php file in the ./include/DatabaseObject directory. Listing 11-43. Automatically Deleting Images When a Blog Post Is Deleted (BlogPost.php) < php class DatabaseObject_BlogPost extends DatabaseObject { // ... other code protected function preDelete() { // ... other code foreach ($this->images as $image) $image->delete(false); return true; } // ... other code } > Now when you try to delete a blog post, all images associated with the post will also be deleted.

Selecting a template within a TemplateField turns that template into its own little design area, showing only that template and none of the others. You can use the normal tools available in Visual Web Developer within this template. The important thing to remember is that when editing a template, any Web controls within the template can see only other Web controls within that template. If you look at any of the validation Web controls and expand the ControlToValidate drop-down list, you ll see that only the TextBox in the template is available. The TextBox controls defined in other templates aren t visible. The validators run at both the client and the server. The client-side validators completely stop the page from being posted back to the server if it has any errors. If the client-side validators accept the page, it is posted back to the server, and the server-side validators are processed before any other events. If the server-side validation fails, the IsValid property of the Page is set to false. As the Page is now invalid, the insert or update action is canceled. The ItemInserting/ItemInserted or ItemUpdating/ItemUpdated events are no longer fired, and the INSERT or UPDATE isn t attempted.

ich controls are web controls that model complex user interface elements. Although no strict definition exists for what is and what isn t a rich control, the term commonly describes a web control that has an object model that s distinctly separate from the HTML it generates. A typical rich control can be programmed as a single object (and added to a web page with a single control tag) but renders itself using a complex sequence of HTML elements. Rich controls can also react to user actions (like a mouse click on a specific region of the control) and raise more meaningful events that your code can respond to on the web server. In other words, rich controls give you a way to create advanced user interfaces in your web pages without writing lines of convoluted HTML. In this chapter, you ll take a look at several web controls that have no direct equivalent in the world of ordinary HTML. You ll start with the Calendar, which provides slick date-selection functionality. Next, you ll consider the AdRotator, which gives you an easy way to insert a randomly selected image into a web page. Finally, you ll learn how to create sophisticated pages with multiple views using two advanced container controls: the MultiView and the Wizard. These controls allow you to pack a miniature application into a single page. Using them, you can handle a multistep task without redirecting the user from one page to another.

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