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The Visual Studio 2010 Integrated Development Environment (IDE) Using Hypertext Markup Language (HTML) and client-side scripting Creating ASP.NET websites and forms Adding web server controls to a webpage Using AJAX on a webpage

ost websites do not require you to write your own custom HTTP handlers. Rather, these are reserved for very special cases, such as when you are writing

a specialized application, a custom processing framework, or a file processor of some kind. That said, most developers I know just can t stand not knowing how their code is processed and executed. Understanding HTTP handlers (and modules) is key to unlocking how HTTP requests are linked to your ASP.NET pages.

Code using keystrokes or mouse clicks is the closest form of automation to reproducing the way users interact with the software but is also one of the most fragile forms of UI automation. Controls move, underlying identifications change, and text is updated and localized. It is possible to write robust automation using only methods that simulate keyboard presses or mouse clicks, but it is difficult and far from failure proof.

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You have created a webpage that contains many controls that are validated by using validation controls. This page also contains Button controls that perform postbacks. You disabled all of the client-side validation and noticed that when you clicked any of the Button controls, the code in the Click event handler was executing even when some of the controls did not have valid data. How can you best solve this problem to ensure that code is not executed when invalid data exists

If you obtain a reference to a collection class (for example, from another component or service that does not implement INotifyCollectionChanged), you can often wrap that collection in an ObservableCollection<T> instance by using one of the constructors that take an IEnumerable<T> or List<T> parameter. Implementing ICollectionView The preceding code example shows how to implement a simple view model property that returns a collection of items that can be displayed via data-bound controls in the view. Because the ObservableCollection<T> class implements the INotifyCollectionChanged interface, the controls in the view will be updated automatically to reflect the current list of items in the collection as items are added or removed.

c. Re-enable the client-side script to disable postback until valid data exists. D. Add the runat="server" attribute to all of the validation controls.

You have created an elaborate webpage that contains many validated controls. You want to provide a detailed message for each validation error, but you don t have space to provide the detailed message next to each control. What can you do to indicate an error at the control and list the detailed error messages at the top of the webpage

and set the Text property to an asterisk. Place a ValidationSummary control at the top of the webpage.

Another form of automation is to automate the actions that occur when the user interacts with the UI. For example, instead of simulating a button click, the automation directly calls the underlying code that the button triggers. Figure 10-1 is a simple variation on what the object-oriented community calls an object model. An object model is a collection of objects (functionality) that allow manipulation of specific parts of the application. For example, the HTML Document Object Model (DOM) provides access to HTML controls (buttons, check boxes, and so forth), embedded links, and browsing history. Languages such as JavaScript can access those controls directly through the DOM.

the ErrorMessage property to an asterisk. Place a ValidationSummary control at the top of the webpage.

Seamless navigation from one webpage to another is what makes a collection of webpages feel like a web application. Developers must consider when and how to move a user between pages. This movement should seem automatic and planned, with the user in control. When setting up navigation, developers need to consider how to handle navigation following postbacks and how to allow a user to navigate within the site. When a page performs a postback, web applications typically end up posting data to the webpage that originated the request. However, there are scenarios in which an application might post data from one webpage to another. Developers also need to consider where the application will navigate to as a result of a particular postback.

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