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

1. You are developing a Windows Store app.
The app will store data in a text file.
You create the following method to store encrypted text in the text file:

The WriteData method writes the contents of an IBuffer object to a StorageFile object.
You need to recommend a solution to encrypt the data. The solution must minimize the use
of system resources and must ensure that the app can decrypt the data.
Which code segment should you recommend adding to line 06?

A) Option B
B) Option D
C) Option C
D) Option A

2. HOTSPOT
You create a class in a namespace named BacJcgrounaTasics by using the following signature:
Public sealed class GetLatestPricesBackgroundTask : IBackgroundTask
The background task connects to a service to retrieve the latest price of the stock information used by an app.
You add code to unregister any background tasks already registered to the OnNavigatedTo event handler for the only page in the app.
You need to ensure that the task runs every 15 minutes once the app starts. You have the following code segment:

Which code snippets should you insert in Target 1, Target 2, and Target 3 to complete the code? (To answer, select the correct code snippet from each drop-down list in the answer area.)

3. You are developing a Windows Store app that allows users to compose musical beats and rhythms.
The app must meet the following requirements:
- The app must save the work in progress in case the app suspends or terminates before users save their work.
- If the app closes before the work is complete, work in progress should be automatically reloaded so that users can continue seamlessly from where they left off.
- Users should be able to resume work on another device with the app installed, provided that the user supplies the same credentials on both machines.
You need to ensure that the app meets the requirements.
How should the app save the work in progress?

A) by serializing it to the local app store
B) by serializing it to the roaming app store
C) by storing it in a memory-mapped file
D) by serializing it to a temporary app store

4. HOTSPOT
You are developing a Windows Store app. You have the following resource table.

You need to use text resources in the app. How should you complete the code segment? (To answer, select the appropriate line of code from each drop-down list in the answer area.)

5. You are developing a Windows Store app to view MP4 videos.
You need to ensure that when a user double-clicks an MP4 file, the app starts and plays back the video automatically.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A) Add the Videos Library capability to the Appxmanifest file.
B) Modify the OnActivated event of the App.xaml.cs file to pass ProtocolActivatedEventArgs to the page if ActivatedEventArgs.Kind == ProtocolActivatedEventArgs.
C) Add an OnFileActivated event handler to the App.xaml.cs file.
D) Add an AutoPlay Content declaration to the Appxmanifest file.
E) Add a File Type Associations declaration to the Appxmanifest file.

Solutions: