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

1. 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.
void playCommand_Executed(object sender, RoutedEventArgs e) {
mediaElementl.Play();
} 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) CommandBinding playCommand = new CommandBinding(MediaCommands.Play); playCommand.CanExecute += new CanExecuteRoutedEventHandler(playCommand_Executed); this.CommandBindings.Add(playCommand);
B) RoutedUICommand playCommand = new RoutedUICommand(); playCommand.CanExecuteChanged += new EventHandler(playCommand_Executed); this.CommandBindings.Add(new CommandBinding(playCommand));
C) RoutedCommand playCommand = new RoutedCommand(); playCommand.CanExecuteChanged += new EventHandler(playCommand_Executed); this.CommandBindings.Add(new CommandBinding(playCommand));
D) CommandBinding playCommand = new CommandBinding(MediaCommands.Play); playCommand.Executed += new ExecutedRoutedEventHandler(playCommand_Executed); this.CommandBindings.Add(playCommand);

2. You are developing a Windows Forms application that contains a DataGridView control. The DataGridView is composed of several fields that capture the customer's name, address, and phone number.
You have been asked to provide data validation in a DataGridView to prevent users from leaving the name field if the name field is empty.
You need to ensure that users cannot tab out of the name field without entering data.
What should you do?

A) Validate the name field in the CellEnter event. Set the focus on the name field if the name field is empty.
B) Validate the name field in the CellErrorTextChanged event. Get e.RowIndex if the name field is empty.
C) Validate the name field in the CellValidating event. Set e.Cancel = True if the name field is empty.
D) Validate the name field in the CancelRowEdit event. Set the focus on the name field if the name field is empty.

3. You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.
You write the following code fragment.
<StackPanel TextBox.PceviewTextInput="StackPanel_PreviewTextInput">
<TextBox Name="TxtBoxA"/>
<TextBox Name="TxtBoxB"/>
<TextBox Naroe="TxtBoxC"/>
</StackPanel>
You create an event handler named StackPanel_PreviewTextInput. You also have a collection of strings named Keywords.
You need to ensure that TxtBoxA and TxtBoxB do not contain any of the strings in the Keywords collections.
Which code segment should you use?

A) Handled = False End If End Sub
B) Handled = False Return End If Next
C) Private Sub StackPanel_PreviewTextInput(sender As Object e As TextCompositionEventArgs) Dim feSource As FrameworkElement = TryCast(e.Source, FrameworkElement) If feSource.Name = "TxtBoxA" OrElse feSource.Name = "TxtBoxB" Then For Each keyword As String In Keywords If e.Text.Contains(keyword) Then e.Handled False Return End If Next
D) Handled = False End If End Sub
E) Handled = True End If End Sub
F) Private Sub StackPanel_PreviewTextInput(sender As Ctoject, e As TextCompositionEventArgs) Dim feSource As FrameworkElement = TryCast(sender, FrameworkElement) If feSource.Name - "TxtBoxA" OrElse feSource.Name - "TxtBoxB" Then For Each keyword As String In Keywords If e.Text.Contains(keyword) Then
G) Private Sub StackPanel_PreviewTextInput(sender As Object, e As TextCompositionEventArgs) Dim feSource As FrameworkElement = TryCast(sender, FraroeworkElement) If feSource.Name = "TxtBoxA" OrElse feSource.Name = "TxtBoxB" Then For Each keyword As String In Keywords If e.Text.Contains(keyword) Then e.Handled = True Return End If Next
H) Private Sub StackPanel_PreviewTextInput(sender As Ctoject, e As TextCompositionEventArgs) Dim feSource As FrameworkElement = TryCast(e.Source, FrameworkElement) If feSource.Name = "TxtBoxA" OrElse feSource.Name = "TxtBoxB" Then For Each keyword As String In Keywords If e.Text.Contains(keyword) Then e.Handled = True Return End If Next
I) Handled = True End If End Sub

4. You are developing a Windows Presentation Foundation (WPF) application. You are implementing a test strategy for the application.
You need to ensure that the history of your testing session can be rewound in the execution cycle so that the state of the application and events that occurred previously can be viewed.
What should you use?

A) intelliTrace
B) visual Studio debugger break points
C) coded UI Tests
D) an error dump file

5. HOTSPOT
You use Microsoft -NET Framework 4 to create a Windows Presentation Framework (WPF)
application.
The application contains a DockPanel named DockPanel1. DockPanel1 contains a ListBox
named List1 and a Button named Buttonl.
You discover that DockPanel1 does not appear in the application.
You set a breakpoint, and then you run the code in debug mode.
You need to identify which property prevents DockPanel1 from appearing in the
application.
Which property should you identify? (To answer, select the appropriate property in the
answer area.)

Solutions: