Change text/value of a label in AutoIt

The following code show an example of a simple GUI and, after the drawing, the change of the text of the label:

#include <GUIConstantsEx.au3>
$gui = GUICreate("My GUI", 200, 200)


$label = GUICtrlCreateLabel("Line 1 Cell 1", 10, 30, 100, 25)


$Button_1 = GUICtrlCreateButton("change label", 100, 100)


GUISetState()


While 1


    $msg = GUIGetMsg()


    Switch $msg


        Case -3; it's the same as $GUI_EVENT_CLOSE


            Exit


        Case $Button_1


            GUICtrlSetData ($label, "New text for label")


    EndSwitch


WEnd

The GUICtrlSetData function, in AutoIt, set or update the value of a GUI control/object.