.NET Remoting and Cross Domain Marshalling

using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Permissions;
using System.Runtime.Remoting.Messaging;
using System.Runtime.Remoting.Proxies;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting;

using System.Runtime.Serialization;

namespace ContextBoundRemoting
{

    /// <summary>
    /// 
    /// </summary>
    public interface ICrossDomainService
    {
        IMessage Marshal(IMessage msg);
    }

    /// <summary>
    /// 
    /// </summary>
    public class CrossDomainService :
        MarshalByRefObject,
        ICrossDomainService
    {
        /// <summary>
        /// 
        /// </summary>
        class Proxy : RealProxy
        {
            string uri;

            [PermissionSet(SecurityAction.LinkDemand)]
            public Proxy(MarshalByRefObject obj)
            {
                this.uri = RemotingServices.Marshal(obj).URI;
            }

            [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.Infrastructure)]
            public override IMessage Invoke(IMessage msg)
            {
                msg.Properties["__Uri"] = this.uri;
                return ChannelServices.SyncDispatchMessage(msg);
            }

        }

        /// <summary>
        /// 
        /// </summary>
        Proxy proxy;

        /// <summary>
        /// 
        /// </summary>
        public CrossDomainService()
        {
            this.proxy = new Proxy(this);
        }

        public override object InitializeLifetimeService()
        {
            return null;
        }

        public IMessage Marshal(IMessage msg)
        {
            return this.proxy.Invoke(msg);
        }
    }


    public class PrintService :
        CrossDomainService,
        IPrintService
    {
        public string PrintMessage(string msg)
        {
            Console.WriteLine("{0} in AppDomain {1}", msg, AppDomain.CurrentDomain.FriendlyName);
            return "Ok " + msg;
        }
    }
}