// RemotableType.cs
using System;
public class RemotableType : MarshalByRefObject{
  private string _internalString = "This is the RemotableType.";
  public string StringMethod(){
    return _internalString;
  }
}

// Listener.cs
using System;
using System.Runtime.Remoting;

public class Listener{
   public static void Main(){
      RemotingConfiguration.Configure("Listener.exe.config");
      Console.WriteLine("Listening for requests. Press Enter to exit...");
      Console.ReadLine();
   }
}

// Client.cs 
using System;
using System.Runtime.Remoting;

public class Client{

   public static void Main(){
      RemotingConfiguration.Configure("Client.exe.config");
      RemotableType remoteObject = new RemotableType();
      Console.WriteLine(remoteObject.StringMethod());
   }
}