Programming with Microsoft Visual Basic 2015 (MindTap Course List)
7th Edition
ISBN: 9781285860268
Author: Diane Zak
Publisher: Cengage Learning
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Expert Solution & Answer
Chapter 4.LC, Problem 1RQ
Program Description Answer
The text box’s “KeyPress” event occurs when pressing any key in the keyboard.
Hence, correct answer is option “D”.
Expert Solution & Answer
Explanation of Solution
The KeyPress event:
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 character 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.
Private Sub CancelKeys(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) _
Handles txtCode.KeyPress, txtSales.KeyPress
'Allows only numbers and the Backspace key in the 'text box
If (e.KeyChar < "0" OrElse e.KeyChar > "9") AndAlso e.KeyChar <> ControlChars.Back Then
'Cancel the key
e.Handled = True
End If
End Sub
The above example is used to accept only the numeric value keys and the backspace key.
Sample Output
Output:
Note: Here, it does not accept the keys other than the numeric and backspace key.
Enter “12” as code. Then, press backspace key to delete the 2.
Screenshot of “Bonus Calculator” form
The 2 will be deleted after pressing the backspace key.
Screenshot of “Bonus Calculator” form
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Chapter 4 Solutions
Programming with Microsoft Visual Basic 2015 (MindTap Course List)
Ch. 4.LA - Prob. 1RQCh. 4.LA - Prob. 2RQCh. 4.LA - Prob. 3RQCh. 4.LA - The six logical operators are listed below....Ch. 4.LA - An expression can contain arithmetic, comparison,...Ch. 4.LA - The expression 6 12 OrElse 4 5 evaluates to...Ch. 4.LA - Prob. 7RQCh. 4.LA - Prob. 8RQCh. 4.LA - Prob. 9RQCh. 4.LA - Prob. 10RQ
Ch. 4.LA - Prob. 11RQCh. 4.LA - Prob. 1ECh. 4.LA - Prob. 2ECh. 4.LA - Prob. 3ECh. 4.LA - Prob. 4ECh. 4.LA - Prob. 5ECh. 4.LA - Prob. 6ECh. 4.LA - Prob. 7ECh. 4.LA - Prob. 8ECh. 4.LA - Prob. 9ECh. 4.LA - Prob. 10ECh. 4.LA - Prob. 11ECh. 4.LA - Prob. 12ECh. 4.LA - Prob. 13ECh. 4.LA - Prob. 14ECh. 4.LA - Prob. 15ECh. 4.LA - Prob. 16ECh. 4.LA - Prob. 17ECh. 4.LA - Prob. 18ECh. 4.LA - Prob. 19ECh. 4.LB - Prob. 1RQCh. 4.LB - Prob. 2RQCh. 4.LB - Prob. 3RQCh. 4.LB - Prob. 4RQCh. 4.LB - Prob. 5RQCh. 4.LB - Prob. 1ECh. 4.LB - Prob. 2ECh. 4.LB - Prob. 3ECh. 4.LB - Prob. 4ECh. 4.LB - Prob. 5ECh. 4.LC - Prob. 1RQCh. 4.LC - Prob. 2RQCh. 4.LC - Prob. 3RQCh. 4.LC - Prob. 4RQCh. 4.LC - Prob. 5RQCh. 4.LC - Prob. 6RQCh. 4.LC - Prob. 1ECh. 4.LC - Prob. 2ECh. 4.LC - Prob. 3ECh. 4.LC - Prob. 4ECh. 4.LC - Prob. 5ECh. 4.LC - Prob. 6ECh. 4.LC - Prob. 7ECh. 4.LC - Prob. 8ECh. 4.LC - Prob. 9ECh. 4.LC - Prob. 10ECh. 4.LC - Prob. 11ECh. 4.LC - Prob. 12ECh. 4.LC - Prob. 13E
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