SimpleClient

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;   //Unused in project
using System.Net.Sockets;

namespace SimpleClient
{
    class Client
    {
        static void Main(string[] args)
        {
            TcpClient client = new TcpClient("127.0.0.1", 6969);
            Console.WriteLine("[Trying to connect to server...]");
            NetworkStream n = client.GetStream();
            Console.WriteLine("[Connected]");
            string ch = Console.ReadLine();
            byte[] message = Encoding.Unicode.GetBytes(ch);
            n.Write(message, 0, message.Length);
            Console.WriteLine("--------------Sent--------------");
            client.Close();
            Console.ReadKey();
        }
    }
}

SimpleServer

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;   //Unused in project
using System.Net.Sockets;

namespace SimpleServer
{
    class Server
    {
        static void Main(string[] args)
        {
            TcpListener listen = new TcpListener(IPAddress.Any, 6969);
            Console.WriteLine("[Listening...]");
            listen.Start();
            TcpClient client = listen.AcceptTcpClient();
            Console.WriteLine("[Client connected]");
            NetworkStream stream = client.GetStream();
            byte[] buffer = new byte[client.ReceiveBufferSize];
            int data = stream.Read(buffer, 0, client.ReceiveBufferSize);
            string ch = Encoding.Unicode.GetString(buffer, 0, data);
            Console.WriteLine("Message recieved: " + ch);
            client.Close();
            Console.ReadKey();
        }
    }
}