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

        private static extern void IncrementOverridesCount();
        [MethodImplAttribute(MethodImplOptions.InternalCall)]

 internal void SetPermitOnly(PermissionSet permSet)
 {
     this.m_restriction = permSet.Copy();
     FrameSecurityDescriptor.IncrementOverridesCount();
 }