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Microsoft Advanced Windows Store App Development using C# Sample Questions:

1. You place a breakpoint at line MP31 in the app.
When you debug the app, the debugger continuously catches a System.UnauthorizedAccess exception.
You need to resolve the exception.
What should you do?

A) At line MP10, change the code segment to the following line of code. read if(cameraUI != null)
B) Wrap lines CE43 through CE46 in a try-catch statement.
C) Move line CE09 to CE16.
D) At line PA25, insert the following line of code. <Capability Name="picturesLibrary"/>

2. HOTSPOT
You are developing a Windows Store app.
The app will use certificates issued by a standalone certification authority (CA) for authentication. The standalone CA certificate is stored in a file named Ca.cer. You need to configure the app manifest to ensure that the app can use certificates issued
by the standalone CA.
You have the following XAML markup in the app manifest:

Which code snippets should you insert in Target 1 and Target 2 to complete the XAML markup? (To answer, select the correct code snippet from each drop-down list in the answer area.)

3. You are developing a Windows Store app to record videos.
The app will provide users with the ability to change the image rotation, ratio, and video
format.
You need to recommend which control to use for the app.
Which control should you recommend?

A) SystemMediaTransportControls
B) CameraCaptureUI
C) MediaCapture
D) MediaElement

4. You are developing a Windows Store app for devices connected to AC power.
The app must meet the following requirements:
- The app must download movie reviews from a web service once per hour. - The app must have new movie reviews ready for the user when the user interacts with the app. - The app cannot interact with the lock screen.
You need to ensure that the web service is called periodically whether the app is running or suspended.
What should you do?

A) Implement the IBackgroundTask interface to make the service call and then register a PushNotificationTrigger object to run the background task when the new reviews are available.
B) Implement the IBackgroundTask interface to make the service call and then register a TimeTrigger object to run the background task every hour.
C) Implement the IBackgroundTask interface to make the service call and then register a MaintenanceTrigger object to run the background task every hour.
D) Use the ThreadPoolTimer.CreatePeriodicTimer() static method to periodically call the web service to get new movie reviews for display.

5. DRAG DROP
You are developing a Windows Store app that allows users to take and edit pictures.
The user interface must remain responsive while the user works with pictures.
You need to ensure that the app allows users to crop captured pictures.
You have the following code: private async void CapturePhoto()

Which code snippets should you include in Target 1 and Target 2 to complete the code? (To answer, drag the appropriate code snippets to the correct targets in the answer area. Each code snippet may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)

Solutions: