using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Security;
using System.Security.Policy;
using System.Reflection;

[assembly: AllowPartiallyTrustedCallers]

namespace Core
{
    public static class Core
    {
        [SecurityCritical]
        public static void RunSafe()
        {
            StreamWriter w = new StreamWriter("ups.txt", true);
            w.WriteLine("Ups...");
            w.Close();
        }

        [SecuritySafeCritical]
        public static void Run()
        {
            RunSafe();
        }
    }
}