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.)

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.)

Accepted Answer

B. Update the binding source as follows. C. Implement the IDataErrorlnfo interface.

Answer

A. Implement the INotifyPropertyChanged interface.

Answer

D. Update the binding source as follows.

70-511 Question #108: Real Exam Question with Answer & Explanation

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