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Make a new project. Add a module. To the form add a command button, a list box and a text box.
Code:
Add this code to the module:

Option Explicit
Private Declare Function SendMessage Lib "User32" Alias "SendMessageA" _
(ByVal hWnd As Long, ByVal wMsg As Integer, ByVal wParam As Integer, lParam _
As Any) As Long
Const LB_FINDSTRING = &H18F

Add this code to the form's Load procedure:

Private Sub Form_Load()
With List1
.Clear
.AddItem "CPU"
.AddItem "RAM"
.AddItem "ROM"
.AddItem "Cache"
.AddItem "Motherboard"
.AddItem "Hard Disk"
.AddItem "Floppy Disk"
End With
End Sub

Add this code to the text box's Change procedure:

Private Sub Text1_Change()
List1.ListIndex = SendMessage(List1.hWnd, LB_FINDSTRING, -1, ByVal _
Text1.Text)
Text1.Text = List1.Text
End Sub		 Search a Listbox

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