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QUESTION 46
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.    Wrap lines CE43 through CE46 in a try-catch statement
B.    At line MP10, change the code segment to the following line of code: read if(cameraUI != null)
C.    Move line CE09 to CE16
D.    At line PA25, insert the following line of code: <Capability Name=”picturesLibrary”/>

QUESTION 47
You need to create a SupportsBacklightCompensation property to accommodate morning and evening photography. Which line of code should you insert at line CA19?

A.    return (video.BacklightCompensation.Capabilities.Min == 0);
B.    return video.BacklightCompensation.Capabilities.Supported;
C.    return (media.BacklightCompensation.Capabilities.Min == 0);
D.    return media.BacklightCompensation.Capabilities.Supported;

Answer: B

QUESTION 48
You need to modify the code at line CE38 to meet the requirements. Which interface should you use for the return type of the method?

A.    IMap
B.    IVector
C.    IVectorView
D.    IList

Answer: C

QUESTION 49
You need to reference the reusable WinMD project. What should you do?

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

Answer: C

Case Study 3: E-reader app (QUESTION 50 – QUESTION 61)
Background
You are developing a Windows Store style e-reader app.
Business Requirements
– Users must be able to upload e-books and documents and download them to e- reader devices.
– Users must be able to set a password to restrict access to their e-books and documents.
– Users must be able to create and store encrypted metadata about their e-books and documents.
– The app must replace system-generated error messages with custom-defined messages. These custom messages must come from a list of approved text.
– User actions such as printing pages, saving users’ current locations in documents, and taking notes should be enabled from buttons on an AppBar control.
– The app must provide trial functionality that will expire after 14 days. If the app expires while it is running, the app must display an expiration message to the user and prompt the user to purchase the app.
Technical Requirements
General:
– Configuration files must be read-only. All user settings must be stored in the Contoso Settings Service.
– The SocialPoller background task must run the code in the DoWork() method to collect content from the Contoso feed.
– The UI must always remain responsive to user actions.
Security
Secured e-book and document passwords must to be encrypted so that only the user who created the passwords can retrieve the metadata associated to the e- books and documents.
The system must log all exceptions through the auditing object and notify technicians of the issue.
Storage:
– The app must cache the next two chapters to the local device for users to read while disconnected from the network. This cache must be persisted if a reboot is performed.
– User state such as the current location in an e-book or document must be stored in the Microsoft SQL Azure database.
– User settings such as font sizes and colors must be stored through the Contoso Settings Service.
Network:
– Communication between the app and e-book vendors must occur over an encrypted communication channel.
– Communication must use certificates to enable the SSL connection.
Trial Functionality:
– The isPrintEnabled variable must determine if the user can print.
– The isMarketEnabled variable must determine if the user can use the marketplace.
– The isTrialEnabled variable must determine if the application is still in trial mode.
Printing:
– The default printing options are portrait orientation and grayscale color mode.
– The app must enable the user to select the media size and printing orientation.
SocialPoller.es

Auditor.cs

ContentPage.es

Book.cs

Book.cs

SocialPost.es

Pagel.xaml.es

App.xaml.cs

QUESTION 50
You need to protect the metadata for the secure documents. Which protection descriptor should you use for the DataProtectionProvider object?

A.    SID
B.    WEBCREDENTIALS=userrpassword
C.    LOCAL=user
D.    USER=current

Answer: C

QUESTION 51
Exceptions occur when the WriteAuditAsync() method of the Auditor object is run. The UI must remain responsive to user actions. You need to handle the exceptions. Which code segment should you use?

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

Answer: A

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QUESTION 52
Drag and Drop Question
You need to add a Print button to the app. 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 53
You need to register the SocialPoller background task in the constructor of the Page1 class. Which statement sets the appropriate task entry point at line PG19?

A.    builder.TaskEntryPoint = “Sreader.Background.SocialPoller”;
B.    builder.BackgroundTableStart = “SocialPoller.Ereader.Background”;
C.    builder.TaskStart = “Pagel.SocialPoller “;
D.    builder.TaskEntryPoint = “Sreader.Pagel”;

Answer: A

QUESTION 54
You need to deactivate features of the app when it runs as a trial. Which lines of code should you use for the production app? (Each correct answer presents part of the solution. Choose all that apply.)

A.    licenseInforination.LicenseChanged += new LicenseChangedEventHandler (modifyLicense)
B.    license.LicenseChanged += new LicenseChangedEventHandler(implementLicense)
C.    licenseInformation = CurrentApp.GetCurrentLicense()
D.    licenseInforrcation = CurrentApp.Licenselnformation
E.    license = CurrentApp.GetCurrentLicense()
F.    licenselnformation.LicenseChanged += new LicenseChangedEventHandler (implementLicense)

Answer: BD

QUESTION 55
You need to set the default print options according to the requirements. Which lines of code should you use at line PG33? (Each correct answer presents part of the solution. Choose all that apply.)

A.    printTask.Options.Orientation = a PrintOrientation.Portrait;
B.    printTask.Options.Orientation = Print.Default = Portrait;
C.    printTask.Options.MediaSize = Print.Default = MediaSize.Legal;
D.    printTask.Options.ColorMode = Print.ColorDefault = Grayscale;
E.    printTask.Options.ColorMode = PrintColorMode. Grayscale;
F.    printTask.Options.MediaSize = PrintMediaSize.Letter;

Answer: AE

QUESTION 56
Drag and Drop Question
You need to call the DoWork() method asynchronously in a background task. Which four lines of code should you use to create the Run() method on line SP13? (To answer, move the appropriate lines of code from the list of code segments to the answer area and arrange them in the correct order.)

Answer:

QUESTION 57
You need to update the DoWork() method of the background task to meet the requirements. What should you do? (Each correct answer presents part of the solution. Choose all that apply.)

A.    Get the IsCancellationRequested property from the CancellationToken object and return a Task CompletionSource object.
B.    Access the Progress object and report the task’s progress to the caller.
C.    Update the DoWork() method to receive a Progress object.
D.    Add the CancellationToken object to the client.GetAsync() method.
E.    Confirm that the IsCancellationRequested property of the CancellationToken object is true and exit the task.
F.    Update the DoWork() method to receive a CancellationToken object in the arguments of the method.

Answer: DEF

QUESTION 58
You need to enable the capabilities that allow communication according to the technical requirements. Which capabilities should you enable? (Each correct answer presents part of the solution. Choose all that apply.)

A.    Shared User Certificates
B.    SSL Certificates
C.    Internet (Client)
D.    Default Windows Credentials

Answer: BC

QUESTION 59
Drag and Drop Question
You need to ascertain whether the app trial period has expired. You have the following code that you plan to insert at line AX22 of App.xaml.cs:

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.)

Answer:

QUESTION 60
You need to handle the following exception and meet the error handling requirements.

Which code segment should you use?

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

Answer: A

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