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Question 11: You are designing an application by using Windows Presentation Foundation (WPF), Microsoft.NET Framework 4, and Microsoft SQL Server 2008.
The application will contain several forms that include custom data validators.
You need to ensure that data is validated before the database updates occur. You also need to
ensure that the validation logic can be reused.
How should you design the validation?
A. Subscribe to the MouseLeave event for all user interface (UI) components of the application.
Perform data validation in the event handler and alert users when a data entry error occurs.
B. Subscribe to the TextChanged event for all user interface (UI) components of the application.
Perform data validation in the event handler and alert users when a data entry error occurs.
C. Implement the INotifyPropertyChanged interface in the data class of the application.
D. Implement the IDataErrorlnfo interface in the data class of the application.
Correct Answer: D
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