Visual
Basic™ Framework
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Software
Engineering: Simple Payroll Program |
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How to write
event procedures for the objects
Table of Contents
Background
Information
A Visual Basic form can be written with code for the objects.
How does this
work?
1. In this program, the significant events are when you type Enter in the textboxes ‘Salary’, and ‘Overtime’.
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To add an event procedure |
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Ø Double click on the object. Ø Select the appropriate event from the pull-down list on the right. In this case the Keypress event. A procedure skeleton will appear. |
2. Type in the following codes. You may copy and paste only the bolded codes to the respective object and procedure.
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Object: ‘Overtime’ - Procedure ‘KeyPress’ |
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Private Sub Overtime_KeyPress
(KeyAscii As Integer) If KeyAscii = 13 Then If Salary <>
"" Or Overtime <> "" Then Paycheque =
Val(Salary) + Val(Overtime) * 5 End If End If End Sub |
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Object: ‘Salary’ - Procedure ‘KeyPress’ |
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Sub Salary_KeyPress (KeyAscii As
Integer) If KeyAscii = 13 Then If Salary <>
"" Or Overtime <> "" Then Paycheque =
Val(Salary) + Val(Overtime) * 5 End If End If End Sub |
3. Test
your program by clicking the Run icon 
on the Toolbar or selecting ‘Start’ from the
Run menu. Enter values in the three
textboxes and see how the program responds.
If any errors occur, correct them and start again.
4. To
stop the program, click the End icon 
or select ‘End’ from the Run menu.
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At this check point, record 2nd Quarter Completion Time: _____________ |
What next?
Complete your program like any other Visual Basic applications by adding a command button to terminate the program.
Last revised:
If you spot an error, please contact sbho@mmu.edu.my In addition, please contact me if you find some aspects of this task is not explained clearly so that I can improve this documentation.