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Question 8: You are developing a Silverlight 4 application.
The application defines the following XAML fragment. (Line numbers are included for reference only.)
01 <ComboBox>
02 <ComboBoxItem Content="Item 1" />
03 <ComboBoxItem Content="Item 2" />
04 <ComboBoxItem Content="Item 3" />
05 </ComboBox>
The codebehind file contains the following code segment. (Line numbers are included for reference only.)
06 void PrintText(object sender, SelectionChangedEventArgs args){
07
08 MessageBox.Show( "You selected " + cbi.Content.ToString() + ".")
09 }
You need to ensure that when the user selects an item in a ComboBox control, the content of the item is
displayed.
What should you do?
A. Replace the following XAML fragment at line 01.
<ComboBox SelectionChanged="PrintText">
Add the following code segment at line 07.
ComboBoxItem cbi = ((sender as ComboBox).SelectedItem as ComboBoxItem)
B. Replace the following XAML fragment at line 01.
<ComboBox SelectionChanged="PrintText">
Add the following code segment at line 07.
ComboBoxItem cbi = ((sender as ComboBox).SelectedIndex as ComboBoxItem)
C. Replace the following XAML fragment at line 01.
<ComboBox DropDownClosed="PrintText">
Add the following code segment at line 07.
ComboBoxItem cbi = ((sender as ComboBox).SelectedItem as ComboBoxItem)
D. Replace the following XAML fragment at line 01.
<ComboBox DropDownClosed="PrintText">
Add the following code segment at line 07.
ComboBoxItem cbi = ((sender as ComboBox).SelectedIndex as ComboBoxItem)
Correct Answer: A