Programming with Microsoft Visual Basic 2017
8th Edition
ISBN: 9781337102124
Author: Diane Zak
Publisher: Cengage Learning
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Expert Solution & Answer
Chapter 4, Problem 4MQ9
Explanation of Solution
Value assigned to the e parameter’s Handled property to cancel the key pressed by the user:
If a key is pressed within a control (i.e. the control has been focused), then the KeyPress event will occur.
- The keyPress event procedure sends the pressed key’s value to the “e” parameter of the keyPress event.
- The acceptance of pressing key has been handled by using the property “Handled”.
e.Handled
- “Handled” property contains the Boolean values “True” or “False”.
- If the “Handled” property of the control is “true”, then the control cancels the pressed keys.
e.Handled=True
- If the “Handled” property of the control is “false”, then the control accepts the pressed keys.
e.Handled = False
Example:
The sub procedure “CancelKeys” allows the text boxes “txtCode” and “txtSales” to accept only the numbers and the backspace key...
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Chapter 4 Solutions
Programming with Microsoft Visual Basic 2017
Ch. 4 - Prob. 1MQ1Ch. 4 - Prob. 2MQ1Ch. 4 - Prob. 3MQ1Ch. 4 - Prob. 1MQ2Ch. 4 - Prob. 2MQ2Ch. 4 - Prob. 3MQ2Ch. 4 - Prob. 4MQ2Ch. 4 - What is the opposite of greater than?Ch. 4 - Prob. 1MQ3Ch. 4 - Prob. 2MQ3
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