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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 with the following class. (Line numbers are included for reference only
The UI is not being updated when the Data property is set.
You need to ensure that the DisplayData class correctly updates the UI when the Data property is set.
What should you do?
A) Insert the following code at line 14. NotifyPropertyChanged("Data");
B) Insert the following code at line 14. NotifyPropertyChanged(value);
C) Insert the following code at line 16. NotifyPropertyChanged("Data");
D) Insert the following line at line 16. NotifyPropertyChanged(value);
2. 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.CheckAcce33()) Then
Dim [function] = New Action(Addre33Cf UpdateUI)
Dim args() As Object = Nothing
Me.Dispatcher.Beginlnvoke([function], args)
Else
UpdateUI()
End If
B) 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
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)
3. You are developing a Windows Presentation Foundation (WPF) application.
The application uses drag-and-drop functionality.
You need to ensure that code is executed in the code-behind file when the dragged item is released onto the target element.
Which enumeration should you use?
A) DragAction.Drop
B) DragDropEffects.All
C) DragAction.Cancel
D) DragDropEffects.None
4. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. The application contains a custom control that is used to display customer Information.
You discover that the custom control is not rendering correctly.
You need to identify the WPF element that is causing the issue.
What should you do?
A) Start the application in release mode.
Place a breakpoint at the main entry point of the application.
Use the debugger to step through the application code.
B) Start the application in debug mode.
Place a breakpoint at the main entry point of the application.
Use the WPF Tree Visualizer tool.
C) Enable IntelliTrace and configure Visual Studio to generate a trace log.
Start the application in debug mode.
D) Enable IntelliTrace and configure Visual Studio to generate a trace log.
Start the application by double-clicking the executable file (.exe).
5. You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.
You write the following code fragment.
< StackPanel TextBox.PreviewTextInput="StackPanel_PreviewTextInput" >
< TextBox Name="TxtBoxA"/>
< TextBox Naroe="TxtBoxB"/>
< TextBox Name="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) private void StackPanel_PreviewTextInput(
object sender, TextCompositionEventArgs e)
(
FrameworkElement feSource = e.Source as FrameworkElement; if
(feSource.Name == "TxtBoxA" || feSource.Name == "TxtBoxB")
{
foreach(string keyword in Keywords)
{
if(e.Text.Contains(keyword))
{
B) Handled = false; return;
}
}
C) private void StackPanel_PreviewTextInput(
object sender, TextCompositionEventArgs e) (
FrameuorkEleroent feSource sender as Framework Element:
if (resource.Name == "TxtBoxA" || feSource.Name == "TxtBoxB")
{
foreach(string keyword in Keywords)
if(e.Text.Contains(keyword) )
{
D) Handled = true; return;
}
}
E) Handled = true; return; )
}
F) private void StackPanel_PreviewTextInput(
object sender, TextCompositionEventArgs e)
{
FrameworkElement feSource = e. Source as FrameworkElement;
if (feSource.Name == "TxtBoxA" || feSource.Name == "TxtBoxB")
{
foreach(string keyword in Keywords) {
if(e.Text.Contains(keyword) )
{
G) Handled = true;
} }
H) Handledfalse;
return;
}
}
I) Handled = false; } }
J) Handled = true;
}
}
K) Handled = false;
}
}
L) private void StackPanel PreviewTextlnput(
object sender, TextCompositionEventArgs e)
{
FrameworkElement feSource = sender as FrameworkElement;
if (feSource.Name == "TxtBoxA" || feSource.Name == "TxtBoxB")
{
foreach(string keyword in Keywords)
{
if(e.Text.Contains(keyword) )
{
Solutions:
Question # 1 Answer: B | Question # 2 Answer: B | Question # 3 Answer: A | Question # 4 Answer: B | Question # 5 Answer: A |