The document discusses controls in Visual Basic like ListBox and CheckedListBox. It provides code examples for adding items to and retrieving selected items from the controls. Events are associated with the controls to handle user interactions like copying items between ListBoxes or getting selected items. The last part replaces the ListBox with a CheckedListBox and modifies the code to retrieve all selected items in a message box.

1. electroteam__@hotmail.com
Electro-Team
Interesting Education

2. ListBox & CheckedListBox

4. DialogBox

5. Display Toolbox

6. Add 2 Buttons & 1 ListBox

7. Display Properties Window

8. Select item property of ListBox

9. Add items of ListBox

10. Press ok to precede

12. Rename Form1 by changing Text property

13. Change Font property for all controls

14. Event
Button_Click
Changing Form1.BackColor

15. Double click Button1

16. Event
ListBox1_SelectedIndexChanged
Changing Form1.BackColor

17. Double click ListBox1

18. Add ListBox2

19. Change Text Property of Button1

20. Event
Button_Click
Copy Item from ListBox1 to ListBox2

22. Event
Button_Click
Moving Item from ListBox1 to ListBox2

24. Clear all Items

25. Event
Button_Click

27. Edit selected Item

28. Event
Button_Click

30. Error
No selection made mean ListBox1.SelectedIndex = -1 , this
value will produce an Error.
ListBox1.Items(ListBox1.SelectedIndex) = TextBox1.Text
ListBox1.Items
White
Red
Black
yellow
ListBox1.SelectedIndex
0
1
2
3

32. Copy selected Item to Textbox

33. Event
ListBox1_SelectedIndexChanged

35. Replace ListBox by CheckedListBox

36. Event
Button_Click
Get all items in message box

38. Code illustration
Dim X As New System.Text.StringBuilder
For I = 0 To 3
X.Append(CheckedListBox1.Items(I))
X.Append(" ")
Next
MessageBox.Show(X.ToString())
System.Text NameSpace
StringBuilder Class
Append(item) Append (String)
ToString Method

39. Dim X As New System.Text.StringBuilder
For Each item In CheckedListBox1.Items
X.Append(item) ‘items
X.Append(" ") ‘spaces
Next
MessageBox.Show(X.ToString())
System.Text NameSpace
StringBuilder Class
Items Property
Append(item) Append (String)
ToString Method
Modify Last Code

40. NameSpace
container for a set of identifiers
(names)
Class
A set of instance information for a
real content.
Property Property
Append (String)
Appends a copy of the specified
string to this instance.
ToString
(Method)
convert the StringBuilder object to a
String object before you can pass
the string represented by the
StringBuilder object to the user
interface.
Code illustration