To display an icon in the message box, specify one of the following values. Value Meaning
MB_ICONEXCLAMATION,
MB_ICONWARNING An exclamation-point icon appears in the message box.
MB_ICONINFORMATION, MB_ICONASTERISK An icon consisting of a lowercase letter i in a circle appears in the message box.
MB_ICONQUESTION A question-mark icon appears in the message box.
MB_ICONSTOP,
MB_ICONERROR,
MB_ICONHAND A stop-sign icon appears in the message box.