Where to declare variables in dialog script

[r0n]

if I put the below code between the "messages" and "sel message", test gets outputted many times.

Code:

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out "test"

The problem is that I declare variables exactly there, I also declare ICsv's there.

Example:

I am referring at the position where the following comment is:

Code:

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;; variables declared here:

Function test_variables_dlg

Code:

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;\Dialog_Editor
function# hDlg message wParam lParam
if(hDlg) goto messages


;BEGIN DIALOG
;0 "" 0x90C80AC8 0x0 0 0 224 136 "Dialog"
;3 QM_Grid 0x56031041 0x200 42 22 96 48 "0[]A[]B"
;1 Button 0x54030001 0x4 116 116 48 14 "OK"
;2 Button 0x54030000 0x4 168 116 48 14 "Cancel"
;END DIALOG
;DIALOG EDITOR: "" 0x2040105 "" "" "" ""

ret
;messages

;; variables declared here:
str- test1
str- test2
str- test4
ICsv- list_csv
list_csv=CreateCsv()
list_csv.ColumnCount=5
list_csv.Separator="*"
list_csv.FromQmGrid(id(3 hDlg))

sel message
,case WM_INITDIALOG
,case WM_DESTROY
,case WM_COMMAND goto messages2
ret
;messages2
sel wParam
,case IDOK
,case IDCANCEL
ret 1

Does this mean for example "list_csv.FromQmGrid(id(3 hDlg))" gets executed many times?
(and that the other variables get constantly re-declared?).
Is there a better way or can I leave the variable declarations at the position as shown my example?