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

2. DRAG DROP
You are developing a Windows Store app that uses a light sensor to detect and respond to light changes. An object named lightSensor is an instance of the sensor service.
The light sensor must detect changes once per second. If the sensor is unable to record as fast as once per second, then it must use the fastest interval possible.
You need to ensure that the app meets the requirements. You have the following code:

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.)

3. HOTSPOT
You are developing a Windows Store app.
You need to encrypt data.
How should you complete the code segment? (To answer, select the appropriate line of
code from each drop-down list in the answer area.)

4. ------
You are designing a Windows Store app to manage image and video files.
The app must meet the following requirements:
Video files must be stored locally on each device.
The app must use local storage for data caching.
User settings must be shared across multiple devices.
Image files must be available across multiple devices.
Metadata for images must be stored in a central database.
Image files, video files, and their associated metadata must load as quickly as
possible.
You need to identify which data must be cached based on the app requirements.
Which two types of data should you identify? (Each correct answer presents part of the solution. Choose two.)

A) Video files
B) Metadata
C) User settings
D) Image files

5. You are developing a Windows Store app that uploads large video files to a web-based video sharing service. You have the following requirements:
- When the app runs on a metered network connection, upload operations must be suspended.
- When the app is suspended, upload operations must continue.
You need to ensure that the app meets the requirements.
What should you do? (Each correct answer presents part of the solution. Choose all that apply.)

A) Create an HttpClient object and use the PutAsync() method to perform the transfer asynchronously.
B) Enable the Internet (Server) capability in the package.appxmanifest file.
C) Enable the Internet (Client) capability in the package.appxmanifest file.
D) Use the XHR class to initiate and run a web upload.
E) Create a BackgroundTransfer object and call the UploadAsync() method.
F) Create a BackgroundUploader object and call the CreateUploadAsync() method.

Solutions: