This is a Push Button style constant used by the SalMessageBox function to specify that both an Ok and a Cancel push button display in the message box. You can combine a Push Button style constant with a constant from the Icon style, Response Button Handling style, and System style constant groups (all of which are also named MB_*) using the OR (|) operator. See SalMessageBox Options and SalMessageBox Returns for more information. Value = 1

public const int MB_OkCancel