70-306 Developing and Implementing Windows-based Applications with Microsoft Visual Basic .NET
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Note 2: 70-306 Answers are not shown in demo questions.
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Demo Question 9.
CKMovers has employed you to develop a package tracking system. Your system uses a tracking number of this format: CK-XXXX-X-9999-9999 You want to add input verification to a data entry application so that tracking numbers are always entered in the same format. While the tracking number text box still has focus, you want to notify users when they press the TAB key if the tracking number that they have entered is not properly formatted. Focus should remain in the tracking number text box until the tracking number is entered correctly. In what text box event should you add code that checks the tracking number formatting and prevents focus from leaving the tracking number text box? (Select the best choice.)
A. Validated
B. LostFocus
C. KeyUp
D. Validating
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Answer: D
The Validating event occurs before the Validated and LostFocus events; therefore, it is
the best location for checking the format of the tracking number. The Validating event
also receives a CancelEventArgs argument. If the Cancel property of CancelEventArgs is
set to True, then the Validated and LostFocus events will not fire and focus will remain
in the text box. The KeyUp event occurs when a keyboard key returns to the up position,
which would cause the validation code to run more often than necessary. The LostFocus
event occurs too late to prevent focus from leaving the text box.
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