gistfile1.cs

using System;
using System.Security;
using System.Security.Permissions;

class B
{
    [X(SecurityAction.Demand)]
    public B() { }
}

class C : B { }

class X : CodeAccessSecurityAttribute
{
    public X(SecurityAction action) : base(action)
    {
        Console.WriteLine("Allocated " + new object());
    }

    public override IPermission CreatePermission()
    {
        return null;
    }
}

class Program
{
    static void Main()
    {
        Console.WriteLine("Allocated " + new C());
    }
}