Server

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;
using System.Text;
using System.Threading.Tasks;



class EvaluatorServer
{
    static void Main(string[] args)
    {
        EvaluatorPlatform();
    }

    static void EvaluatorPlatform()
    {
        TcpChannel tcpChannel = new TcpChannel(9998);
        ChannelServices.RegisterChannel(tcpChannel, true);
        Type commonInterfaceType = Type.GetType("Driving");
        RemotingConfiguration.RegisterWellKnownServiceType(commonInterfaceType, "DrivingLesson", WellKnownObjectMode.SingleCall);

        System.Console.WriteLine("Press Enter to Quit");
        System.Console.ReadLine();
    }
}

    public interface gradeCalculate
    {
        //void Start();
        bool authenticate(string username, string password);
    }

    public class Driving : MarshalByRefObject, gradeCalculate
    {
        string serverUsername, serverPassword ;
        bool authenticated;



    //public void Start()
    //{
    //    Console.WriteLine("Started!");
    //}

    public bool authenticate(string username, string password)
    {
        serverUsername = "aa";
        serverPassword = "123";

        if (username == serverUsername && password == serverPassword)
        {
            authenticated = true;
        }
        else
        {
            authenticated = false;
        }


        return authenticated;

    }


}