CodeItBetter Programming Another VB Programming Blog

'Controls - Various ways to add/remove items into list box control
'To add an item in list box
Private Sub Form_Load()
    List1.AddItem "First"
    List1.AddItem "Second"
    List1.AddItem "Third"
End Sub
 
'In real-world applications, you rarely load individual items in this way. Most
'often your data is already stored in an array or in a database, and you have to
'scan the source of your data with a For…Next loop, as in the following code:

' MyData is an array of strings.
For i = LBound(MyData) To UBound(MyData)
    List1.AddItem MyData(i)
Next
 
'If you want to load dozens or hundreds of items, a better approach is to store
'them in a text file and have your program read the file when the form loads.
'This way you can later change the contents of your ListBox controls without
'recompiling the source code:

Private Sub Form_Load()
    Dim item As String
    On Error GoTo Error_Handler
    Open "listbox.dat" For Input As #1
    Do Until EOF(1)
        Line Input #1, item
        List1.AddItem item
    Loop
    Close #1
    Exit Sub
Error_Handler:
    MsgBox "Unable to load Listbox data"
End Sub
 
'If you want to load many items in a list box but don't want to create an array,
'you can resort to Visual Basic's Choose function, as follows:

For i = 1 To 5
    List1.AddItem Choose(i, "America", "Europe", "Asia", "Africa", "Australia")
Next
 
'Some special cases don't even require you to list individual items:
' The names of the months (locale-aware)
For i = 1 To 12
    List1.AddItem MonthName(i)
Next
 
' The names of the days of the week (locale-aware)
For i = 1 To 7
    List1.AddItem WeekdayName(i)
Next
 
' Remove the first item in the list.
List1.RemoveItem 0
 
' Quickly remove all items (no need for a For...Next loop).
List1.Clear