Exam 70-491 Recertification for MCSD: Windows Store Apps using C#

Published: August 1, 2014
Languages: English, Japanese
Audiences: Developers
Technology: Visual Studio
Credit toward certification: MCP, MCSD

Skills measured
This exam measures your ability to accomplish the technical tasks listed below. View video tutorials about the variety of question types on Microsoft exams.

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Design Windows Store apps
Design the UI layout and structure
Evaluate the conceptual design; decide how the UI will be composed; design for the inheritance and re-use of visual elements (e.g., styles, resources); design for accessibility; decide when custom controls are needed; use the Hub App template

Develop Windows Store apps
Implement search
Provide search suggestions using the SearchPane and SearchBox control class; search and launch other apps; provide and constrain search within an app, including inside and outside of search charm; provide search result previews; implement activation from within search; configure search contracts
Implement Share in an app
Use the DataTransferManager class to share data with other apps; accept sharing requests by implementing activation from within Share; limit the scope of sharing using the DataPackage object; implement in-app Share outside of Share charm; use web links and application links
Manage app settings and preferences
Choose which app features are accessed in AppSettings; add entry points for AppSettings in the Settings window; create settings flyouts; store and retrieve settings from the roaming app data store
Integrate media features
Support DDS images; implement video playback; implement XVP and DXVA; implement Text to Speech (TTS)

Create the user interface
Create layout-aware apps to handle windowing modes
Use CSS3 media queries to adapt to different devices; respond to changes in orientation; adapt to new windowing modes by using the ViewManagement namespace; manage setting for an apps view
Design and implement the app/nav bar
Determine what to put on the app/nav bar based on app requirements; style and position app/nav bar items; design the placement of controls on the app/nav bar; handle app/nav bar events; design the placement of controls on the app/nav bar
Design and implement data presentation
Choose and implement data controls and properties to meet app requirements (e.g., ListView, GridView, FlipView, DatePicker, TimePicker, Hyperlink, PlaceholderText, menu flyouts, and CommandBar); create data templates to meet app requirements

Program user interaction
Notify users by using toast
Enable an app for toast notifications; populate toast notifications with images and text by using the ToastUpdateManager; play sounds with toast notifications; respond to toast events; control toast duration; configure and use Azure Mobile Services for push notifications

Manage security and data
Choose an appropriate data access strategy
Choose the appropriate data access strategy (file based; web service; remote storage, including Microsoft Azure storage and Azure Mobile Services) based on requirements
Manage Windows Authentication and Authorization
Retrieve a user’s roles or claims; store and retrieve credentials by using the PasswordVault class; implement the CredentialPicker class; verify credential existence by using credential locker; store account credentials in app settings
Manage Web Authentication
Use the Windows.Security.Authentication.Web namespace; set up OAuth2 for authentication; CredentialPicker; set up single sign-on (SSO); implement credential roaming; implement the WebAuthenticationBroker class; support proxy authentication for enterprises

Discover and interact with devices
Capture media with the camera and microphone
Use CameraCaptureUI to take pictures or video, and configure camera settings; use MediaCapture to capture pictures, video, and audio; configure camera settings; set media formats; handle media capture events; implement advanced photo capabilities, such as sequence mode, thumbnails, and focus mode
Get data from sensors
Determine the availability of a sensor (Windows.devices.sensors); add sensor requests to the app manifest; handle sensor events; get sensor properties; determine location via GPS; enable geofencing
Implement device access
USB; Bluetooth; Human Interface Device (HID); 3D printer support; Point of Service (PoS) devices

Program user interaction
Implement Play To by using contracts and charms
Register an app for Play To; use PlayToManager stream media assets; register an app as a PlayToReceiver; programmatically implement PlayTo functionality
Notify users by using Windows Push Notification Service (WNS)
Authenticate with WNS; request, create, and save a notification channel; call and poll the WNS; configure and implement push notifications by using Azure Mobile Services

Enhance the user interface
Create custom controls
Choose the appropriate base control to create a custom control template; style a control through control templates; design the control template to respond to changes in windowing modes

Manage data and security
Design and implement data caching
Choose which types of items (user data, settings, application data) in your app should be persisted to the cache based on requirements; choose when items are cached; choose where items are cached (Microsoft Azure, Azure Mobile Services, remote storage); select a caching mechanism; store data by using indexDB, LocalStorage, and SessionStorage
Save and retrieve files
Handle file streams; save and retrieve files by using the StorageFile and StorageFolder classes; set file extensions and associations; save and retrieve files by using file pickers and the folder picker; compress files to save space; access libraries and KnownFolders, for example, pictures, documents, and videos; manage appearance of the file picker; improve searchability by using Windows Index; integrate OneDrive with apps; compare files; manage libraries
Secure application data
Encrypt data by using the Windows.Security.Cryptography namespace; enroll and request certificates; encrypt data by using certificates; revoke file permissions

Prepare for a solution deployment
Design and implement a test strategy
Recommend a functional test plan; implement a coded UI test; recommend a reliability test plan (performance testing, stress testing, scalability testing, duration testing); implement unit testing in an app; simulate in-app purchases
Evaluate and configure for Windows store deployment
Configure app options to submit to store, such as age restrictions, privacy statement, permissions, images, and contact information; create application files, resource files, and application bundles; verify application readiness by using the Windows Application Certification Kit (WACK)

QUESTION 1
Users report performance issues when getting the location information associated with a photo. You suspect the app is encountering performance issues in the GetLocationAsync() method of the Environment class.
You need to enhance the performance of the GetLocationAsync() method of the app.
What should you do?

A. Remove the Compass initialization from the LoadSensors() method and initialize it within the GetLocationAsync() method.
B. set the ReportInterval property of the Compass object to 16.
C. set the ReportInterval property of the Compass object to 0.
D. Move the locator variable to a class level variable and initialize it in the Environment
constructor.

Answer: D

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QUESTION 2
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”/>

Answer: D

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QUESTION 2
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 Snapped and Filled 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 App.manifest file, configure the Portrait and Portrait-flipped orientations.
F. In the Package.appxmanifest file, configure the Landscape and Landscape-flipped
orientations.

Answer: F

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QUESTION 4
You need to localize the Picture Sharer app in the required language.
Which actions should you perform? (Each correct answer presents part of the solution. Choose all that apply.)

A. Add a Uid attribute to any XAML elements that must be localized.
B. Create a folder named fr-CA at the root of the project.
C. Create a resource file named resources.res.
D. Create a resource file named resources.resw.
E. Create a folder named es-ES at the root of the project.
F. Add a Name attribute to any XAML elements that must be localized.

Answer: A,B,D

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