loop

#include <ButtonConstants.au3>
#include <EditConstants.au3>
#include <GUIConstantsEx.au3>
#include <StaticConstants.au3>
#include <WindowsConstants.au3>
$Form1 = GUICreate("main form", 442, 169, 192, 124)
$Input1 = GUICtrlCreateInput("", 112, 56, 201, 21)
$Label1 = GUICtrlCreateLabel("type any thing in following box for display in message", 24, 24, 387, 28)
GUICtrlSetFont(-1, 10, 800, 0, "MS Sans Serif")
$Button1 = GUICtrlCreateButton("display", 272, 96, 131, 33)
GUICtrlSetFont(-1, 12, 400, 0, "MS Sans Serif")
$Button2 = GUICtrlCreateButton("Exit", 80, 96, 107, 33)
GUICtrlSetFont(-1, 12, 400, 0, "MS Sans Serif")
GUISetState(@SW_SHOW)
While 1
$nMsg = GUIGetMsg()
Switch $nMsg
  Case $GUI_EVENT_CLOSE
   Exit
  case $Button1
   if $Input1 <>"" Then
	MsgBox(0,"", GUICtrlRead($input1))
   Else
	MsgBox(0,""," you do not enter any thing in box therefor you will return to main form")
	;what is script that return to main form
   EndIf
   case $Button2
	Exit
EndSwitch
WEnd