You are developing a Windows Presentation Foundation (WPF) application page.
The page uses extensive graphics controls and animation that require absolute positioning.
You need to select a control to use as a container.
Which control should you select?

• A. Grid
• B. Canvas
• C. StackPanel
• D. DockPanel

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. The application contains a form named frmMain that contains a button named btnSave.
You create a ProgressBar control named saveProgress. Initially, saveProgress is not displayed on frmMain.
When a user clicks btnSave, you have the following requirements:
- saveProgress is slightly visible after 0.2 seconds
- saveProgress is fully visible after 1 second
You need to declare the corresponding storyboard.
You write the following code fragment. (Line numbers are included for reference only.)
01 <Storyboard xiKey" animateProgress" TaEgetName="saveProgress">
03 </Storyboard>
Which code fragment should you insert at line 02 to complete the declaration?

• A. <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility"><DiscreteObjectKeyFrame KeyTime="00:00:00" Value="{x:Static Visibility.Collapsed)" /><DiscreteObjectKeyFrame KeyTime="00:00:01" Value="{x:Static Visibility.Visible)" /></ObjectAnimationUsingKeyFrames>
• B. <DoubleAnimation Storyboard.TargetProperty="Opacity" Duration="00:00:01" From="0" To="1" />
• C. <DoubleAnimation Storyboard.TargetProperty="Opacity" Duration="l" From="0" To="l" />
• D. <ObjectAnimationUsingKeyFrames Storyboard. TargetProperty="Visibility"><DiscreteObjectKeyFrame KeyTime""0" Value="{x:Static Visibility.Collapsed)" /><DiscreteObjectKeyFrame KeyTime="l" Value="{x:Static Visibility-Visible)" /></ObjectAnimationUsingKeyFrames>

You develop a Windows Presentation Foundation (WPF) application. This application is used to output data trends to customer service representatives.
You use threading to keep the UI responsive. You have a function named UpdateUI that updates all of the UI components.
You use the following code to update the _Data variable. (Line numbers included for reference only.)

You need to update the user interface without knowing if you are on the UI thread.
Which code segment should you insert at line 06?

• A. if (this.Dispatcher. CheckAccess ();
  {
  var function = new Action (Updated);
  this.Dispatcher.ReginInvoke(function, null);
  }
  else
  { UpdateUI(); }
• B. if (this.Dispatcher.CheckAccess() )
  UpdateUI ();
  }
  else
  {
  var function = new Action(UpdateUI);
  this. Dispatcher.ReginInvoice(function, null);
  }
• C. this.Dispatcher.VerifyAccess();
  UpdateUI() ;
• D. this.Dispatcher.VerifyAccess();
  var function = new Action(UpdateUI);
  this. Dispatcher.BecginInvoke{function, null);

You are develping a Windows Presentation Foundation (WPF) application.
You plan to deploy the WPF application by using ClickOnce. The application will be associated to files that have an extension of .abc.
You need to ensure that when a user opens the application by double-clicking an .abc file, a TextBlock named txtBlockl displays the path of the file.
Which code should you use?

• A. txtBlock1.Text = DataContext .ToString ();
• B. txtBlock1.Text = AppDomain. CurrentDomain.Setup Information. ActivationArguments. ActivationData \0\ .ToString ();
• C. txttBlock1.Text = App.Current.Properties["ActivationData"].ToString();
• D. txttBlock1.Text = App.Current.Properties["FilePath"].ToString();

You are developing a Windows Presentation Foundation (WPF) application for managing student information. You place a Button control named btnSort and a DataGrid control named dgStudents on the design surface of the MainWindow.xaml file. You create a Student class with two properties: FirstName and LastName. You create the following code segment in the constructor of the main window.

The DataGrid control displays the list of students unsorted.
You need to ensure that the list of students is sorted by last name.
Which code segment should you add to the click event handler of the Button control?

• A. Dim sortedStudents As IEnumerable(Of Student) Students.orderBy (Function (s) s.LastName) dgStudents.ItemsSource = sortedStudents
• B. Students.Sort() dgStudents.ItemsSource = Students
• C. Dim sortedStudents As IEnnumerable(Of Student) = Students.OrderBy(Function(s) s.LastName).ToList() dgstudents.ltemssource = sortedStudents
• D. Students.Reversed dgStudents.ItemsSource = Students