آیدی کنترل ها در MessageBox

https://www.cadsharp.com/docs/Win32API_PtrSafe.txt

IDABORT 3	The Abort button was selected.
IDCANCEL 2	The Cancel button was selected.
IDCONTINUE 11	The Continue button was selected.
IDIGNORE 5	The Ignore button was selected.
IDNO 7	The No button was selected.
IDOK 1	The OK button was selected.
IDRETRY 4	The Retry button was selected.
IDTRYAGAIN 10	The Try Again button was selected.
IDYES 6	The Yes button was selected.

SendDlgItemMessageA

SetDlgItemTextA