Client just for test

A

 public class MyRemoteClass : MarshalByRefObject, IMyInterface
    {
        public int FunctionOne(string str)
        {
            return str.Length;
        }
    }

client.cs

Client some stuff

namespace Client
{
    using System;
    using System.Runtime.Remoting;
    using System.Runtime.Remoting.Channels;
    using System.Runtime.Remoting.Channels.Tcp;
    using System.Runtime.Remoting.Messaging;
    using ClientA;
    static class MyClient
    {
        private delegate int MyDelegate(string s);
        public static void Main()
        {
            var mTcpChan = new TcpChannel(9999);

            ChannelServices.RegisterChannel(mTcpChan);
            RemotingConfiguration.RegisterWellKnownServiceType(
                Type.GetType("ClientA.MyRemoteClass,ClientA"),
                "FirstRemote", WellKnownObjectMode.SingleCall);

        //    ChannelServices.RegisterChannel(m_TcpChan);
            var m_RemoteObject = (IMyInterface)
            Activator.GetObject(typeof(IMyInterface),
            "tcp://vivi-pc:9999/FirstRemote");
            var m_delegate =
                new MyDelegate(m_RemoteObject.FunctionOne);
            m_delegate.BeginInvoke("Amazing",
                new AsyncCallback(MyCallBack), null);
            System.Console.WriteLine("Press ENTER to quit");
            System.Console.ReadLine();

        }

        private static void MyCallBack(IAsyncResult ar)
        {
            int l = ((MyDelegate)((AsyncResult)ar).AsyncDelegate).EndInvoke(ar);
            Console.WriteLine(l);
           
        }
    }
}