CHAPTER 3- Lesson C is the continuation of Lessons A and B.

1. Hello!
I am Ma. Wennilou Porazo
Instructor
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2. Using
Variables and
Constants

3. After studying Lesson C, you should
be able to:
● • Include a static variable in code
● Code the TextChanged event procedure
● Create a procedure that handles more than one event
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4. Modifying the Load and Click Event Procedures
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5. Modifying the Load and Click Event Procedures
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6. Coding the TextChanged Event Procedure
● TextChanged event
○ Occurs when the Text property value of a control
changes
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7. Coding the TextChanged Event Procedure
(cont.)
● Can occur
○ The use enters data into the control
○ The code assigns data to the control’s Text
Property
● Example: A change is made to the number of items
ordered
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8. Associating a Procedure with Different Objects
and Events
● Handles clause
○ Appears in an event procedure’s header
○ Indicates the object and event associated with
the procedure
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9. Associating a Procedure with Different Objects and
Events (cont.)
● You can associate an event procedure with more
than or object and/ or event
○ In the Handles section of procedure header, list
each and event separated by commas
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10. Associating a Procedure with Different Objects
and Events
● Procedure names are entered in Pascal case
○ Capitalize the first letter in the name and the first
letter of each subsequent word in the name
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13. Lesson C Summary
● To process code when a change is made to the
contents of a control’s Text property:
○ Enter the code in the control’s TextChanged
event procedure.
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14. Lesson C, Summary
● To associate a procedure with more than one object
or event:
○ List each object and event (using the syntax
object.event) after the Handles keyword in the
procedure header. Use a comma to separate an object
and event from the previous object and event.
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15. Reference
● Book
○ Programming with Microsoft Visual Basic
2010, 5th edition
○ Author: Diane Zak
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16. Thanks!
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