You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.  
The application contains an ObservableCollection object named Pictures that contains several Picture objects. 
Each Picture object contains the Name and PictureFilePath properties. 
You add a ListBox control to the application. 
You need to ensure that the pictures are displayed in the ListBox control. 
Which code fragment should you use?（）

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. 
The application contains three text boxes named txtAddress, txtCity, and txtState. 
You need to ensure that the postal code is automatically set based on the information typed by users in the text boxes.  
You also need to ensure that the complete address is displayed in a TextBlock control. 
Which code fragment should you use?（）