c# itextsharp create barcode Figure 10 1. SMS is composed and ready to go to Andrew. in Microsoft Word

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Figure 10 1. SMS is composed and ready to go to Andrew.
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Working with the Windows Phone 7 Application Life Cycle
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To program responsive applications on a Windows Phone 7 device, you must be familiar with the concept of tombstoning on that platform. The simplest way to explain tombstoning is to describe it as an event that happens when your application loses focus on the Windows Phone 7 device, such as when a user invokes a launcher or a chooser, or presses the hardware Start button. When your application loses focus, the Windows Phone OS realizes that there is a good chance that the user will want to come back, or reactivate your application shortly, and he or she will expect to find it in its previous state. Therefore, instead of simply terminating your application as soon as it loses focus, the Windows Phone OS remembers its state and provides developers with a means to save session-related information to a custom State dictionary object. However, with tombstoning, there is always a chance that your application may never be reactivated. So, if there is data that needs to be permanently preserved within your application, you should save it to the isolated storage instead of the transient State object. You will get to observe tombstoning at work shortly, but before that, you need to walk through a typical life cycle of a Windows Phone 7 application. Table 10 3 summarizes the application events that can occur during the execution of a typical Windows Phone 7 application. The table also describes the actions you as a developer should take when each of those events occurs.
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CHAPTER 10 INTEGRATING APPLICATIONS WITH THE WINDOWS PHONE OS
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Table 10 3. Applications Events, Triggers, and Actions
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Application Event
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Application_Launching
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Occurs When
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The user taps the entry for an application on the installed applications screen, and a new instance of an application is created.
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Your Actions
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Do not read application settings from the isolated storage as that will slow down the loading process; do not attempt to restore transient state. When an application launches, it should always appear as a new instance. The application should allow the user to continue interaction as if she had never left the application; transient state information should be restored, but the application should not attempt to read the contents of the isolated storage to avoid potential slowdown. You should save all transient (i.e., related to the current application session) state into the State dictionary. You should save persistent state to an isolated storage. Applications are given ten seconds to complete this event; after ten seconds, if this event is still not completed, an application will be terminated and not tombstoned.
Application_Activated
For this event to occur, two conditions must be met: (1) the user navigates away from your application, either by using a launcher or a chooser, or by starting another application and (2) the user then comes back to your application by either completing the launcher or chooser or using the hardware Back button. This event is not raised when an application is first launched.
Application_Deactivated
The user navigates away from your application either by invoking a launcher or a chooser, or by launching another application. This event is not raised when your application is closing.
Application_Closing
The user uses the Back key to navigate past the first page of your application.
Save all of the persistent state into the isolated storage.
In the next section, you will code and observe the conditions under which each of the events in the application life cycle is triggered.
Observing Application Life Cycle Events
To help you better understand the conditions under which tombstoning occurs and the events that are fired, let s enhance the application built previously in this chapter to trace the events raised within the application.
CHAPTER 10 INTEGRATING APPLICATIONS WITH THE WINDOWS PHONE OS
Enhancing the User Interface
You will enhance the application user interface by adding a text box and a button control to the design surface of MainPage.xaml to make it look similar to Figure 10 2. 1. 2. Launch Visual Studio 2010 Express, and open the previously created Tasks project. Double-click MainPage.xaml in Solution Explorer, and add a text box and a button to the design surface, as shown in Figure 10 2. Clear the Text property of the text box, and set the button s caption to Launch Browser.
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