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Exam Code: 70-485
Exam Name: Advanced Windows Store App Development Using C#
Certification Provider: Microsoft
Corresponding Certification: MCSD: Windows Store Apps

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QUESTION 121
Drag and Drop Question
You plan to deploy an app to the Windows Store.
The app will have a trial mode of 30 days.
You need to develop a solution that displays a notification on the main page that shows the number of days remaining before the trial mode expires.
Develop the solution by selecting and ordering the required code snippets.
You may not need all of the code snippets.

Answer:

QUESTION 122
You are evaluating the following code that is part of a method named SelectMove:

You need to recommend a replacement for the for each loop to reduce the amount of time that it takes for SelectMove to execute.
Which code segment should you recommend?

A.    Option A
B.    Option B
C.    Option C
D.    Option D

Answer: D

QUESTION 123
You are developing a Windows Store app that integrates with a stock trading website on the Internet.
The app must meet the following requirements:
– The app must allow the user to view stock details.
– The app must be able to get the updated stock information every five minutes from an Internet web service.
You need to configure the app to meet the requirements.
What should you do?

A.    Create a BackgroundDownloader object and then call the CreateDownloadAsync() method to specify
the frequency of the stock information update.
B.    Add a Background Tasks declaration in the package.appxmanifest file and select the timer task type to
collect stock information periodically.
C.    Enable the Home or Work Networking capability in the package.appxmanifest file.
D.    Enable the Lock Screen Notifications capability in the package.appxmanifest file.

Answer: B

QUESTION 124
You are developing a Windows Store app that will download files from a remote server.
You need to recommend a solution to display a custom message if a network error occurs during a file download.
What should you include in the recommendation?

A.    Wrap the asynchronous call in a try/catch block
B.    Wrap the Window.Current.ActivateQ call in a try/catch block.
C.    Register an event handler for the Application.UnhandledException event and call Application.Current.Exit.
D.    Register an event handler for the Application.UnhandledException event and set e.Handled to true.

Answer: A

QUESTION 125
Drag and Drop Question
You are developing a Windows Store app.
The following code is provided as part of an RSS feed reader.

You need to create an asynchronous method that reports progress and allows cancellation.
Which three actions should you perform in sequence? (To answer, move the appropriate actions from the list of actions to the answer area and arrange them in the correct order.)

Answer:

QUESTION 126
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.    CameraCaptureUI
B.    MediaCapture
C.    SystemMediaTransportControls
D.    MediaElement

Answer: B

QUESTION 127
Hotspot Question
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.)

Answer:

QUESTION 128
You are developing a Windows Store app.
The app has the following requirements:
– The app must print from the Devices charm.
– In-app printing must be invoked by using a Print button on the user interface.
You need to ensure that the user can print documents successfully.
Which code segments should you use? (Each answer presents part of the solution. Choose all that apply.)

A.    Option A
B.    Option B
C.    Option C
D.    Option D

Answer: BD
Explanation:
B: ShowPrintUIAsync is an asynchronous method and it is responsible for making your Windows Store app display the appropriate print window. Here is a JavaScript code snippet to show how it is used to display a print window:
// Function to process the print button click
function printButtonClick() {
Windows.Graphics.Printing.PrintManager.showPrintUIAsync(); }
D: Example:
1. To each screen in your app from which you want to print, add the following code so that it runs when the screen is opened. In the PrintSampleJS sample app, this is done in the ready member of the members parameter to the WinJS.UI.Pages.define function that is called to create the screen.
JavaScript
var printManager = Windows.Graphics.Printing.PrintManager.getForCurrentView(); printManager.onprinttaskrequested = onPrintTaskRequested;
Add the print-task event handler for that screen. Each screen in your app might need a different function if, for example, the content of each needs to be formatted differently for printing.
This PrintSampleJS app includes a completion handler, which is shown here. It’s a good idea to handle completion events because then your app can let the user know if an error occurred and provide possible solutions. Likewise, your app could use the completion event to indicate subsequent steps for the user to take after the print job is successful.
JavaScript
function onPrintTaskRequested(printEvent) {
var printTask = printEvent.request.createPrintTask(“Print Sample”, function (args) { args.setSource(MSApp.getHtmlPrintDocumentSource(document));
// Register the handler for print task completion event printTask.oncompleted = onPrintTaskCompleted;
});
}

QUESTION 129
You are developing a Windows Store app for a security monitoring company.
You have been asked to build a module that uploads large video files to a web-based video sharing service.
You have the following requirements:
– The video codex must match the proprietary format developed by the company’s internal labs.
– 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 a BackgroundUploader object and call the CreateUploadAsync() method to transfer the video file.
B.    Enable the Internet (Client) capability in the package.appxmanifest file.
C.    Enable the Internet (Server) capability in the package.appxmanifest file.
D.    Create an HttpClient object and use the PutAsync() method to perform the transfer the video file
asynchronously.
E.    Create a BackgroundTransfer object and call the UploadAsync() method to transfer the video file.
F.    Use the XHR class to initiate and run a web upload of a video file.

Answer: CF
Explanation:
C: To ensure your Windows Store app is network ready, you must set the capability in the project Package.appxmanifest file.
Capability: Internet (Client & Server)
Gives the app inbound and outbound network access from the Internet and networks in public places like airports and coffee shops.
This is the internetClientServer capability in the app manifest.
A:
* BackgroundUploader class
Background Transfer is primarily designed for long-term transfer operations for resources like video, music, and large images. For short-term operations involving transfers of smaller resources (i.e. a couple KB), use the Windows.Web.Http namespace (not D).
* BackgroundUploader.CreateUploadAsync | createUploadAsync methods
Initializes an asynchronous UploadOperation.
* Example:
BackgroundUploader uploader = new BackgroundUploader(); uploader.SetRequestHeader(“Filename”, file.Name); UploadOperation upload = uploader.CreateUpload(uri, file);
// Attach progress and completion handlers.
await HandleUploadAsync(upload, true);

QUESTION 130
You need to configure the Picture Sharer app to support only the required device orientations. What should you do?

A.    In the App.xaml file, configure the Portrait and Portrait-flipped orientations.
B.    In the Package.appxmanifest file, configure the Landscape and Landscape-flipped orientations.
C.    In the PictureSharerMainPage.xaml file, configure the Landscape and Landscape-flipped orientations.
D.    In the App.xaml file, configure the Portrait and Landscape orientations.
E.    In the Package.appxmanifest file, configure the Snapped and Filled orientations.
F.    In the App.manifest file, configure the Portrait and Portrait-flipped orientations.

Answer: B

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