namespace HelloWorld.Shared
{
    public interface ISayHelloService
    {
        event Action<string, string> MessageReceived;
        
        void Say(string name, string message);
    }
}

using System;
using CoreRemoting;
using CoreRemoting.DependencyInjection;
using HelloWorld.Shared;

namespace HelloWorld.Server
{
    public class SayHelloService : ISayHelloService
    {
        // Event to notify clients when users post new chat messages
        public event Action<string, string> MessageReceived;
        
        // Call via RPC to say something in the chat 
        public void Say(string name, string message)
        {
            MessageReceived?.Invoke(name, message);
        }
    }

    public static class HelloWorldServer
    {
        static void Main(string[] args)
        {
            using var server = new RemotingServer(new ServerConfig()
            {
                HostName = "localhost",
                NetworkPort = 9090,
                RegisterServicesAction = container =>
                {
                    // Make SayHelloSevice class available for RPC calls from clients
                    container.RegisterService<ISayHelloService, SayHelloService>(ServiceLifetime.Singleton);
                }
            });
            
            server.Start();
            
            Console.WriteLine("Server is running.");
            Console.ReadLine();
        }
    }
}

using System;
using CoreRemoting;
using HelloWorld.Shared;

namespace HelloWorld.Client
{
    public static class HelloWorldClient
    {
        static void Main(string[] args)
        {
            using var client = new RemotingClient(new ClientConfig()
            {
                ServerHostName = "localhost",
                ServerPort = 9090
            });
            
            client.Connect();

            // Create a proxy of the remote service, which behaves almost like a regular local object
            var proxy = client.CreateProxy<ISayHelloService>();
            
            // Receive chat messages send by other remote users by event
            proxy.MessageReceived += (senderName, message) => 
                Console.WriteLine($"\n  {senderName} says: {message}\n");
            
            Console.WriteLine("What's your name?");
            var name = Console.ReadLine();

            Console.WriteLine("\nEntered chat. Type 'quit' to leave.");

            bool quit = false;

            while (!quit)
            {
                var text = Console.ReadLine();

                if (text != null && text.Equals("quit", StringComparison.InvariantCultureIgnoreCase))
                    quit = true;
                else
                {
                    // Post a new chat message
                    proxy.Say(name, text);
                }
            }
        }
    }
}