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Question 12: You are developing an application by using Silverlight 4 and Microsoft.NET Framework 4.
You create a new user control in the application. You add the following XAML fragment to the control.
<StackPanel KeyDown="App_KeyDown"
Orientation="Vertical">
<TextBox x:Name="firstName" />
<TextBox x:Name="lastName" />
<TextBox x:Name="address" />
</StackPanel>
You add the following code segment in the codebehind file of the control. (Line numbers are included for
reference only.)
01 private void App_KeyDown(object sender, KeyEventArgs e)
02 {
03
04 }
05
06 private void FirstAndLastNameKeyDown()
07 {
08...
09 }
You need to ensure that the FirstAndLastNameKeyDown method is invoked when a key is pressed while
the focus is on the firstName or lastName TextBox controls. You also need to ensure that the default
behavior of the controls remains unchanged.
Which code segment should you add at line 03?
A. if (((FrameworkElement)sender).Name == "firstName" ||
((FrameworkElement)sender).Name == "lastName")
{
FirstAndLastNameKeyDown()
}
e.Handled = false
B. if (((FrameworkElement)sender).Name == "firstName" ||
((FrameworkElement)sender).Name == "lastName")
{
FirstAndLastNameKeyDown()
}
e.Handled = true
C. if (((FrameworkElement)e.OriginalSource).Name == "firstName" ||
((FrameworkElement)e.OriginalSource).Name == "lastName")
{
FirstAndLastNameKeyDown()
}
e.Handled = false
D. if (((FrameworkElement)e.OriginalSource).Name == "firstName" ||
((FrameworkElement)e.OriginalSource).Name == "lastName")
{
FirstAndLastNameKeyDown()
}
e.Handled = true
Correct Answer: C
