Hi, here some code:

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// remoting server
using System;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;

namespace Test
{
    public class Server
    {
        private static int mPort = 60000;

        public static void Main(string[] args)
        {
            try
            {
                ChannelServices.RegisterChannel(new TcpChannel(mPort), true);
                RemotingConfiguration.RegisterActivatedServiceType (typeof(BusinessTier));
                Console.WriteLine("Server started on port " + mPort);
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }

            Console.WriteLine("Press enter to exit...");
            Console.ReadLine();
        }
    }
}

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// client activated object
using System;
using System.Collections;
using System.IO;
using System.Runtime.Remoting;

namespace Test
{
    public class BusinessTier : MarshalByRefObject
    {
        public BusinessTier()
        {
        }

        public bool Connect(string user, string pass)
        {
            // connect to database
        }

        private void Dispose(bool disposing)
        {
            // close connection
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        ~BusinessTier()
        {
            Dispose(false);
        }
    }
}

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// client application
...
ChannelServices.RegisterChannel(new TcpChannel(), true);
RemotingConfiguration.RegisterActivatedClientType(
    new ActivatedClientTypeEntry(typeof(BusinessTier), SERVER));

mBsTier = new BusinessTier();
mBsTier.Connect(user, pass);
...

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Problem:
Why server don't call BusinessTier.Dispose() when it stopped or client disconnected by timeout?