You are developing a Windows Presentation Foundation (WPF) application. You add a TextBox control to the design surface and bind it to an underlying window resource named dsGiftCertificate. The control uses the binding XAML as follows. You need to provide a custom error message in the tooltip of the TextBox when the user leaves the textbox. Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A. Implement the INotifyPropertyChanged interface.

B. Update the binding source as follows.

C. Implement the IDataErrorlnfo interface.

D. Update the binding source as follows.

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70-511 · Question #229

70-511 Question #229: Real Exam Question with Answer & Explanation

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Question

You are developing a Windows Presentation Foundation (WPF) application. You add a TextBox control to the design surface and bind it to an underlying window resource named dsGiftCertificate. The control uses the binding XAML as follows. <Binding Source="{StaticResource dsGiftCertificate}" UpdateSourceTrigger = "LostFocus" Path="Coupon" /> You need to provide a custom error message in the tooltip of the TextBox when the user leaves the textbox. Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

Options

AImplement the INotifyPropertyChanged interface.
BUpdate the binding source as follows.
CImplement the IDataErrorlnfo interface.
DUpdate the binding source as follows.

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