Need help with combobox

[Analyze]

Can you tell me please how to use Combox i understand how to creat but how i can make if item2 select then do msg Hallo World.

#include <GUIConstants.au3>

GUICreate("My GUI combo")  ; will create a dialog box that when displayed is centered.

GUICtrlCreateCombo ("item1", 10,10) ; creates the first item in a, combo box.
GUICtrlSetData(-1,"item2|item3","item3") ; add other items, and set a new default to display item 3.

GUISetState () ; make the GUI visible.

; Run the GUI until the dialog is closed.
While 1
    $msg = GUIGetMsg() ; check for an input/message.
    
    If $msg = $GUI_EVENT_CLOSE Then ExitLoop ; on a close event, exit the loop.
Wend

[Yashied]

#Include <GUIConstants.au3>

GUICreate("My GUI combo")
$Combo = GUICtrlCreateCombo("item1", 10, 10)
GUICtrlSetData(-1, "item2|item3", "item3")
GUISetState()

While 1
    $Msg = GUIGetMsg()
    Switch $Msg
        Case $GUI_EVENT_CLOSE
            Exit
        Case $Combo
            If GUICtrlRead($Combo) = 'item2' Then
                MsgBox(0, '', 'Hallo World!')
            EndIf
    EndSwitch
WEnd

[Analyze]

Big thx now i learn much more about this fuktion.How to use it.