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Microsoft TS: Windows Applications Development with Microsoft .NET Framework 4 Sample Questions:

1. You are developing a Windows Presentation Foundation (WPF) application. This
application will be used to display customer data to customer service representatives.
Phone numbers are stored as ten-digit numbers in the database.
The markup is as follows.
<TextBlock Text="{Binding Path=PhoneNumber,
ConvertersStaticResource PhoneFormatConverter}}" />
You need to ensure that phone numbers are displayed in the following format: (###) ### -
####
Which markup segment should you use?

A) public object ConvertBack(object value, Type targetType,
object parameter, CultureInfo culture)
{
return String.Format("{0: (###)###-####)",
(long)value);
}
B) public object Convert (object value, Type targetType,
object parameter, CultureInfo culture)
{
return String.Format["{0:(###)###-####)",
(long)parameter);
}
C) public object Convert (object value. Type targetType,
object parameter, CultureInfo culture)
{
return String.Format("{0: (###)###-####)", (long)value);
}
D) public object ConvertBack(object value, Type targetType,
object parameter, CultureInfo culture)
{
return String. Format ("{0: (###)###-####)", (long)parameter);
}

2. You are developing a Windows Presentation Foundation (WPF) application to play audio files. You add a MediaElement control named mediaElementl and a Button control named btnPlayAudio to the design surface. The MediaElement control Source attribute is set to an audio file. The LoadedBehavior attribute is set to Manual.
You add the following code to the main window.
Sub playCoinroand_Executed (ByVal sender As Object,
ByVal e As RoutedEventArgs)
MediaElenient 1.Play ()
End Sub
You set the command of the button to MediaCommands.Play.
You need to ensure that the application will play the audio file when the button is pressed.
What should you add to the constructor of the main window?

A) Dim playCommand As CoinmandBinding =
New CommandBinding(MediaCommands.Play)
AddHandler playCommand.CanExecute,
New CanExecuteRoutedEventHandler(
AddressOf playCommand_Executed)
Me.CommandBindings.Add(playCommand)
B) Dim playCommand As CoinmandBinding =
New CoinmandBinding (MediaCommands.Play)
AddHandler playCommand.Executed,
New ExecutedRoutedEventHandler(
AddressOf playCommand_Executed)
Me.CommandBindings.Add(playCommand)
C) Dim playCommand As RoutedUICommand = New RoutedUICommand()
AddHandler playCommand.CanExecuteChanged,
New EventHandler(AddressOf playCommand_Executed) Me . CommandBindings .
Add (New CommandBinding (playCommand) )
D) Dim piayCommand As RoutedCommand = New RoutedCommand()
AddHandler playCommand.CanExecuteChanged,
New EventHandler(AddressOf playComrnand_Executed)
Me.CommandBindings.Add(New CoinmandBinding (playCommand))

3. You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.
You add a property named ServiceContext to a control.
You need the value of ServiceContext to flow to the child controls exactly like the value of the DataContext property of the FrameworkElement class.
What should you do?

A) Declare a new property.
In the get and set methods of the new property, create an instance of the TraversalRequest
class.
B) Inherit the control class from the DependencyObject class.
C) Declare a new property.
In the get method of the new property call VisualTreeHelper.GetParent.
In the set method of the new property, call VisualTreeHelper.GetChild.
D) Register a dependency property.
In the options settings of the property metadata, specify the Inherits option.

4. You have the following code in a Windows Presentation Foundation (WPF) application:

You need to animate the ellipse.
Which code segment should you use to declare the animation at line 13?

A) PointAnimation a = new PointAnimation();
B) DiscreteVectorKeyFrame a = new DiscreteVectorKeyFrame();
C) AnimationTimeiine a;
D) DoubleAnimation a = new DoubleAnimation();

5. You use Microsoft .NET Framework 4 to create a Windows Forms application.
You add a new class named Customer to the application. You select the Customer class to create a new object data source.
You add the following components to a Windows Form:
- A BindingSource component named customerBindingSource that is data-bound to the Customer object data source.
- A set of TextBox controls to display and edit the Customer object properties. Each TextBox control is data-bound to a property of the customerBindingSource component.
- An ErrorProvider component named errorProvider that validates the input values for each TextBox control.
You need to ensure that the input data for each TextBox control is automatically validated by using the ErrorProvider component.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A) Add the following code segment to the InitializeComponent method of the Windows
Form.
this.errorProvider.DataSource = this.customerBindingSource.DataSource;
this.errorProvider.DataMember = this.customerBindingSource.DataMember;
B) Implement the validation rules inside the setter of each property of the Customer class
by throwing an exception when the value is invalid.
C) Implement the validation rules inside the Validating event handler of each TextBox
control by throwing an exception when the value is invalid.
D) Implement the validation rules inside the TextChanged event handler of each TextBox
control by throwing an exception when the value is invalid.
E) Add the following code segment to the InitializeComponent method of the Windows
Form.
this.errorProvider.DataSource = this.customerBindingSource;

Solutions: