You are designing an application by using Windows Presentation Foundation (WPF) and
Microsoft .NET Framework 4. The application retrieves customer data from an enterprise
resource planning (ERP) system. You need to ensure that the following requirements are
met: • Customer data is retrieved only once. • Customer data is available on multiple forms
within the application. • Forms can implement Two-Way binding to the customer data. What
should you do?
A.
Store the results of the query in a local XML file. Bind all forms to an XMLDataAdapter
object that references the local XML file.
B.
Design a static class for the data that implements the [Observable interface. Subscribe to
the static class from each of the forms that use the data.
C.
Store the results of the query in a static DataTable object that is used by all the forms.
D.
Design a static class for the data that implements the INotifyPropertyChanged interface.
Raise the PropertyChanged event to notify the forms when data is changed.