- 65 -17.31. SecurityExceptionAn exception that is thrown when an open request is issued to a device file for which authorization for openingcannot be obtained (e.g., when the file is already opened).¾ Syntax[VB]Public Class SecurityExceptionInherits System.SecurityException[C#]public class SecurityException : System.SecurityException¾ NamespaceDNWA.BHTCL¾ AssemblyDNWA.Exception.dll