This enumeration provides several additional options to a MessageBox , including the right-to-left status ( RtlReading ), whether the box should always be shown on the DefaultDesktopOnly , whether it should RightAlign the text, and whether this is a ServiceNotification (i.e., the MessageBox is shown even if no user is logged on to the system). public enum MessageBoxOptions { DefaultDesktopOnly = 0x00020000 , RightAlign = 0x00080000 , RtlReading = 0x00100000 , ServiceNotification = 0x00200000 } HierarchySystem.Object System.ValueType System.Enum(System.IComparabl, System.IFormattable , System.IConvertible) MessageBoxOptions Passed ToMessageBox.Show() |