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Microsoft Essentials of Developing Windows Store Apps using C# Sample Questions:

1. You are developing a Windows Store app that will read data from a file that is stored on a hard disk. The app will display that data on the screen.
You need to ensure that portions of the app can be reused in WinRT, Windows Presentation Foundation (WPF), Microsoft Silverlight, and Windows Phone apps.
What should you do?

A) Create a page, a ViewModel object, and a FileHelper class. Set the page's DataContext property to reference the ViewModel object. Program the ViewModel object to use the FileHelper class to load data from the file, and populate its properties with that data. Program the page to consume the data by using data binding.
B) Create a page and a ViewModel object. Set the page's DataContext property to reference the ViewModel object. Program the ViewModel object to load data from the file and populate its properties with that data. Program the page to consume the data by using data binding.
C) Create a page and a ViewModel object. Program the page to use the Loaded event to load data from the file and then update the page contents to reflect the data from the file. Program the ViewModel object to use the Windows.Data.FileLoader class to populate its properties from the file.
D) Create a page and a ViewModel object. Set the page's DataContext property to reference the ViewModel object. Program the page so that its Loaded event reads data from the file and populates the properties of the ViewModel object with that data. Program the page to consume the data by using data binding.

2. You need to ensure that the app resumes according to the requirements.
Which actions should you perform? (Each correct answer presents part of the solution. Choose all that apply.)

A) update the user interface by using the Window.Current.Dispatcher.Invoke() method in the App_Resuming event handler.
B) Register the App_Resuming event handler for the Resuming event.
C) Override the OnLaunched event handler.
D) Retrieve new user content by using the Window.Current.Dispatcher.ProcessEvents() method in the OnLaunched event handler when the ActivationKind is Launch.
E) Update the user interface by using the Window.Current.Dispatcher.Invoke() method in the OnLaunched event handler when the ActivationKind is Launch.
F) Retrieve new user content by using the Window.Current.Dispatcher.ProcessEvents()
method in the App_Resuming event handler.

3. HOTSPOT
You are developing a Windows Store app.
A page contains information that is entered by the user.
You need to ensure that the information is retained on the page if the user navigates away from the page and then returns.
You have the following code:

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

4. DRAG DROP
You are developing a Windows Store app.
You are using the Model-View-ViewModel (MVVM) architectural pattern to design the app.
You need to identify the type of code to place in each layer.
How should you distribute the code? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment 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.)

5. You are developing a Windows Store app that will back up video files.
The app will support videos up to 1 GB in size.
If users lose their device, they must be able to restore the video files to a new device.
You need to recommend a storage solution for the app.
Which storage solution should you recommend?

A) Windows Azure blob storage
B) SQLite for Windows Runtime
C) roaming storage
D) AppData

Solutions: