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Exam : Microsoft 70-502(VB)
Title : TS: Microsoft .NET Framework 3.5 - Windows Presentation Foundation


1. You are creating a Windows Presentation Foundation application by using Microsoft .NET Framework 5.
The application defines a BrowserWindow class. Each instance of the BrowserWindow class allows the user to browse a Web site in a separate window. When a new browser window is opened, the user is redirected to a predefined URL.
You write the following code segment.
01 Private Sub OpenNewWindow(ByVal sender As Object, _
02 ByVal e As RoutedEventArgs)
03 Dim newWindowThread As New Thread(New _
04 ThreadStart(AddressOf NewThreadProc))
05
06 newWindowThread.Start()
07 End Sub
08 Private Sub NewThreadProc()
09 10 End Sub
You need to ensure that the following requirements are met:
The main window of the application is not blocked when an additional browser window is created.
The application completes execution when the main window of the application is closed.
What should you do?
A. Insert the following code segment at line 05.
newWindowThread.SetApartmentState(ApartmentState.STA)
newWindowThread.IsBackground = True
Insert the following code segment at line 09.
Dim newWindow As New BrowserWindow()
newWindow.Show()
Dim app As New Application()
app.Run(newWindow)
B. Insert the following code segment at line 05.
newWindowThread.IsBackground = True
Insert the following code segment at line 09.
newWindowThread.SetApartmentState(ApartmentState.STA)
Dim newWindow As New BrowserWindow()
newWindow.Show()
Dim app As New Application()
app.Run(newWindow)
C. Insert the following code segment at line 05.
newWindowThread.SetApartmentState(ApartmentState.STA)
newWindowThread.IsBackground = False
Insert the following code segment at line 09.
Dim newWindow As New BrowserWindow()
System.Windows.Threading.Dispatcher.Run()
newWindow.Show()
D. Insert the following code segment at line 05.
newWindowThread.SetApartmentState(ApartmentState.STA)
newWindowThread.IsBackground = True
Insert the following code segment at line 09.
Dim newWindow As New BrowserWindow()
newWindow.Show()
System.Windows.Threading.Dispatcher.Run()
Answer: D

2. You are creating a Windows Presentation Foundation application by using Microsoft .NET Framework 3.5.
The application uses several asynchronous operations to calculate data that is displayed to the user. An operation named tommorowsWeather performs calculations that will be used by other operations.
You need to ensure that tommorowsWeather runs at the highest possible priority.
Which code segment should you use?
A. tomorrowsWeather.Dispatcher.BeginInvoke( _
System.Windows.Threading.DispatcherPriority.Normal, _
New OneArgDelegate(AddressOf UpdateUserInterface), weather)
B. tomorrowsWeather.Dispatcher.BeginInvoke( _
System.Windows.Threading.DispatcherPriority.DataBind, _
New OneArgDelegate(AddressOf UpdateUserInterface), weather)
C. tomorrowsWeather.Dispatcher.BeginInvoke( _
System.Windows.Threading.DispatcherPriority.Send, _
New OneArgDelegate(AddressOf UpdateUserInterface), weather)
D. tomorrowsWeather.Dispatcher.BeginInvoke( _
System.Windows.Threading.DispatcherPriority.Render, _
New OneArgDelegate(AddressOf UpdateUserInterface), weather)
Answer: C

3. You have created a Windows Presentation Foundation application by using Microsoft .NET Framework 3.5. The application, named EnterpriseApplication.exe, runs over the network.
You add the WindowSize parameter and the WindowPosition parameter to the Settings.settings file by using the designer at the User Scope Level. The dimensions and position of the window are read from the user configuration file.
The application must retain the original window size and position for users executing the application.
You need to ensure that the following requirements are met:
The window dimensions for each user are saved in the user configuration file.
User settings persist when a user exits the application.
Which configuration setting should you use?
A. Private Sub OnClosing(ByVal sender As Object, ByVal e _
As System.ComponentModel.CancelEventArgs)
My.Settings.Default.WindowPosition = New Point(Me.Left, Me.Top)
My.Settings.Default.WindowSize = New Size(Me.Width, Me.Height)
My.Settings.Default.Save()
End Sub
B. Private Sub OnClosing(ByVal sender As Object, ByVal e As _
System.ComponentModel.CancelEventArgs)
Dim appKey As RegistryKey = _
Registry.CurrentUser.CreateSubKey("SoftwareEnterpriseApplication")
Dim settingsKey As RegistryKey = _
appKey.CreateSubKey("WindowSettings")
Dim windowPositionKey As RegistryKey = _
settingsKey.CreateSubKey("WindowPosition")
Dim windowSizeKey As RegistryKey = _
settingsKey.CreateSubKey("WindowSize")
windowPositionKey.SetValue("X", Me.Left)
windowPositionKey.SetValue("Y", Me.Top)
windowSizeKey.SetValue("Width", Me.Width)
windowSizeKey.SetValue("Height", Me.Height)
End Sub
C. Private Sub OnClosing(ByVal sender As Object, ByVal e As _
System.ComponentModel.CancelEventArgs)
Dim doc As New System.Xml.XmlDocument()
doc.Load("EnterpriseApplication.exe.config")
Dim nodePosition As System.Xml.XmlNode = _
doc.SelectSingleNode("//setting[@name='WindowPosition']")
nodePosition.ChildNodes(0).InnerText = String.Format("{0},{1}", _
Me.Left, Me.Top)
Dim nodeSize As System.Xml.XmlNode = _
doc.SelectSingleNode("//setting[@name='WindowSize']")
nodeSize.ChildNodes(0).InnerText = String.Format("{0},{1}", _
Me.Width, Me.Height)
doc.Save("UserConfigDistractor2.exe.config")
End Sub
D. Private Sub Window_Closing(ByVal sender As Object, ByVal e As _
System.ComponentModel.CancelEventArgs)
Dim sw As New StreamWriter("EnterpriseApplication.exe.config", True)
sw.WriteLine("<EnterpriseApplication.Properties.Settings>")
sw.WriteLine("<setting name=""WindowSize"" serializeAs=""String"">")
sw.WriteLine(String.Format("<value>{0},{1}</value>", Me.Width, _
Me.Height))
sw.WriteLine("</setting>")
sw.WriteLine("<setting name=""WindowPosition"" _
serializeAs=""String"">")
sw.WriteLine(String.Format("<value>{0},{1}</value>", Me.Left, _
Me.Top))
sw.WriteLine("</setting>")
sw.WriteLine("</UserConfigProblem.Properties.Settings>")
sw.Close()
End Sub
Answer: A

4. You are creating a Windows Presentation Foundation application by using Microsoft .NET Framework 3.5.
You add a CommandBinding element to the Window element. The command has a keyboard gesture CTRL+H. The Window contains the following MenuItem control.
<MenuItem Header="Highlight Content"
Command="local:CustomCommands.Highlight" />
You need to ensure that the MenuItem control is disabled and the command is not executable when the focus shifts to a TextBox control that does not contain any text.
What should you do?
A. Set the IsEnabled property for the MenuItem control in the GotFocus event handler for the TextBox controls.
B. Set the CanExecute property of the command to Highlight_CanExecute.
Add the following method to the code-behind file for the window.
Private Sub Highlight_CanExecute(ByVal sender As Object, _
ByVal e As CanExecuteRoutedEventArgs)
Dim txtBox As TextBox = CType(sender, TextBox)
e.CanExecute = (txtBox.Text.Length > 0)
End Sub
C. Set the CanExecute property of the command to Highlight_CanExecute.
Add the following method to the code-behind file for the window.
Private Sub Highlight_CanExecute(ByVal sender As Object, _
ByVal e As CanExecuteRoutedEventArgs)
Dim txtBox As TextBox
txtBox = CType(e.Source, TextBox)
e.CanExecute = (txtBox.Text.Length > 0)
End Sub
D. Set the CanExecute property of the command to Highlight_CanExecute.
Add the following method to the code-behind file for the window.
Private Sub Highlight_CanExecute(ByVal sender As Object, _
ByVal e As CanExecuteRoutedEventArgs)
Dim Menu As MenuItem = CType(e.Source, MenuItem)
Dim txtBox As TextBox = CType(Menu.CommandTarget, TextBox)
Menu.IsEnabled = (txtBox.Text.Length > 0)
End Sub
Answer: C

5. You are creating a Windows Presentation Foundation application by using Microsoft .NET Framework 3.
You create a window for the application.
You need to ensure that the following requirements are met:
An array of strings is displayed by using a ListBox control in a two-column format.
The data in the ListBox control flows from left to right and from top to bottom.
What should you do?
A. Use a ListBox control defined in the following manner.
<ListBox Name="myList">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<UniformGrid Columns="2"/>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
Use the following VB.net code to associate the array of strings to the ListBox control.
myList.ItemsSource = arrayOfString
B. Use a ListBox control defined in the following manner.
<ListBox Name="myList">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
Use the following vb.net code to associate the array of strings to the ListBox control.
myList.ItemsSource = arrayOfString
C. Use a ListBox control defined in the following manner.
<ListBox Name="myList">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
Use the following vb.net code to associate the array of strings to the ListBox control.
myListView.ItemsSource = arrayOfString
D. Use a ListBox control defined in the following manner.
<ListBox Name="myList">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
</Grid>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
Use the following vb.net code to associate the array of strings to the ListBox control.
myList.ItemsSource = arrayOfString
Answer: A