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, Problem 3MQ9

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Chapter 4 Solutions

Programming with Microsoft Visual Basic 2017

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Solution Summary: The author explains how the KeyPress event procedure sends the pressed key's value to the "e" parameter of the keypress event.

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