System.Security.FrameSecurityDescriptor.HasImperativeDenials C# (CSharp) Method

        internal bool HasImperativeDenials() 
        {
            // we store declarative actions in both fields, so check if they are different
            return (m_denials != null);
        }
        internal bool HasImperativeRestrictions() 

        [System.Security.SecurityCritical]  // auto-generated
        internal static void Deny(PermissionSet permSet, ref StackCrawlMark stackMark)
        {
#if FEATURE_CAS_POLICY
            // Deny is only valid in legacy mode
            if (!AppDomain.CurrentDomain.IsLegacyCasPolicyEnabled)
            {
                throw new NotSupportedException(Environment.GetResourceString("NotSupported_CasDeny"));
            }
#endif // FEATURE_CAS_POLICY

            FrameSecurityDescriptor secObj =
                SecurityRuntime.GetSecurityObjectForFrame(ref stackMark, true);

            Contract.Assert(secObj != null, "Failure in SecurityRuntime.Deny() - secObj != null");
            if (secObj == null)
            {
                // Security: REQ_SQ flag is missing. Bad compiler ?
                System.Environment.FailFast(Environment.GetResourceString("ExecutionEngine_MissingSecurityDescriptor"));
            }
            else
            {
                if (secObj.HasImperativeDenials())
                {
                    throw new SecurityException(Environment.GetResourceString("Security_MustRevertOverride"));
                }

                secObj.SetDeny(permSet);
            }
        }