Microsoft
70-355 · Question #30
70-355 Question #30: Real Exam Question with Answer & Explanation
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Question
You are developing a Universal Windows Platform (UWP) app. The application architecture uses the Model-View-ViewModel (MVVM) pattern. You are designing a form to add new contacts to the app. The form contains an input field named LastName and a Save button. You need to ensure that when LastName is empty, the Save button is disabled. What should you use?
Options
- AOn the Save button, change the IsDefaulted property and the IsDefault property.
- BUse an InputType enumeration that has a Command member.
- CUse a CommandBinding object that contains a CanExecute event.
- DOn the Save button, change the IsSeleted value.
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