You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You write the following code fragment. (Line numbers are included for reference only.)
01 <Canvas>
02 <Rectangle Stroke="Red" Stroke Thickness="5" Height="60"
03 Width-"60" Canvas. Leftoff Canvas.Top-"100"> 04
05 </Rectangle>
06 </Canvas>
You need to rotate the rectangle by 45 degrees by using its upper-left corner as the axis.
Which code fragment should you insert at line 04?

• A. <Rectangle.RenderTransform>
  <RotateTransform Angle="45" CenterX="100" CenterY="100"
  /></Reccangle.RenderTransform>
• B. <Rectangle.LayoutTransform>
  <RotateTransform Angle="45" CenterX="0" CenterY-"0"/>
  </Rectangle.LayoutTransform>
• C. <Rectangle.RenderTransforro>
  <RotateTransform Angle="45" CenterX="0" CenterY=rf0" /></Rectangle.RenderTransform>
• D. <Rectangle.LayoutTransform>
  <RotateTransforro Angle="45" CenterX="100"
  CenterY="100"/></Rectangle.LayoutTransform>

You are developing a Windows Presentation Foundation (WPF) application.
Two styles, Blue and Green, are used for Border objects. The two styles have the same values for the CornerRadius and BrushThickness properties and different values for the Background property.
You need to define the CornerRadius and BrushThickness settings in either the Blue or the Green style, but not both.
What should you do?

• A. Put Blue and Green into the same file. Put the base settings in Blue and mark Blue as BasedOn Green.
• B. Separate Blue and Green into two files. Put the base settings in Blue and use MergedDictionaries. Ensure that the Green file is second in the list.
• C. Separate Blue and Green into two files. Put the base settings in Blue and use MergedDictionaries. Ensure that the Blue file is second in the list.
• D. Put Blue and Green into the same file. Put the base settings in Blue and mark Green as BasedOn Blue.

You are developing a Windows Presentation Foundation (WPF) application.
An event triggers a workflow such that a parent control executes the event handlers before the child controls.
You need to ensure that if a parent control's event handler encounters an error, the subsequent handlers are not called.
What should you do?

• A. Use handlers for a tunneling routed event and mark the event as handled in the case of a problem.
• B. Use handlers for a bubbling routed event and set the Handled property of the RoutedEventArgs object to true in the catch portion of a try-catch-finally code block.
• C. Use handlers for a tunneling routed event and mark the event as handled in the finally portion of a try-catch-finally code block.
• D. Use handlers for a bubbling routed event and mark the event as handled in the case of a problem.

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 (Me. Dispatcher. CheckAccess())
  Then UpdateUI()
  Else
  Dim (function] = New Action(AddressCf OpdateUI)
  Dim args() As Object = Nothing
  Me .Dispatcher ,BeginInvoIce ( [function; , args)
  End If
• B. If (Me.Dispatcher.CheckAcce33()) Then
  Dim [function] = New Action(Addre33Cf UpdateUI)
  Dim args() As Object = Nothing
  Me.Dispatcher.Beginlnvoke([function], args)
  Else
  UpdateUI()
  End If
• C. Me. Dispatcher.VerifyAccess ()
  UpdateUI()
• D. Me.Dispatcher.VerifyAccess()
  Dim [function] = New Action(AddressCf UpdateUI)
  Dim args() As Object = Nothing
  Me .Dispatcher .BeginlnvoJce ([function], args)

You develop a Windows Presentation Foundation (WPF) application. This application is used to output data trends to customer service representatives.
A data trend analysis is performed in a function named UpdateTrendData. The trend analysis is a long-running process.
The application contains the following code segment.
Class MainWindow: Window {
private void UpdateData(object arg)
{
double data = UpdateTrendData();
... } }
UpdateData is currently invoked on the UI thread when the form is first displayed. You need to process the data in a manner that does not cause the UI to freeze. What should you do?

• A. Use this.Dispatcher.Beginlnvoke to invoke UpdateData passing in the priority of Normal.
• B. Use ThreadPool.SetMaxThreads(2, 2) and invoke UpdateData.
• C. Use ThreadPool.QueueUserWorkItem to invoke UpdateData.
• D. Use this.Dispatcher.BeginInvoke to invoke UpdateData passing in the priority of Background.