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Код

using System;
using System.Security;
using System.Security.Policy;
using System.IO;
using System.Reflection;
using System.Runtime.Remoting;

[assembly: SecurityRules(SecurityRuleSet.Level2)]
namespace SimpleTest
{
    class Program
    {
        static void Main(string[] args)
        {
            //Создание домена
            AppDomainSetup info = new AppDomainSetup();
            info.ApplicationBase = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
            StrongName sName_Main = Assembly.GetExecutingAssembly().Evidence.GetHostEvidence<StrongName>();
            AppDomain domain = AppDomain.CreateDomain("sundboxedWithFT", null, info, GetPermissionSet(), new StrongName[] { sName_Main});
            //Создание экземпляра объекта в изолированном домене
            Type t = typeof(FileWriter);
            ObjectHandle handle = Activator.CreateInstanceFrom(domain, t.Assembly.ManifestModule.FullyQualifiedName, t.FullName);
            FileWriter infos = (FileWriter)handle.Unwrap();
            //Выполнение небезопасного кода, вызывающего исключение
            infos.WriteInfo();
        }


        public static PermissionSet GetPermissionSet()
        {
            Evidence ev = new Evidence();
            ev.AddHostEvidence(new Zone(SecurityZone.Internet));
            return SecurityManager.GetStandardSandbox(ev);
        }
    }

    class FileWriter:MarshalByRefObject
    {
        public void WriteInfo()
        {
            using (System.IO.FileStream fstr = new System.IO.FileStream(@"test.txt", System.IO.FileMode.OpenOrCreate))
            {
                fstr.Write(System.Text.Encoding.Default.GetBytes("\nhello from app"), 0, 15);
                fstr.Flush();
                fstr.Close();
            }
        }
    }
}