C#

using System;
using System.Net.Sockets;
using System.IO;
using System.ComponentModel;

namespace NetClient
{
    class Program
    {
        
        static void Main(string[] args)
        {
            NetworkStream networkStream;

            StreamWriter streamWriter;
            TcpClient myclient;
            try
            {
                myclient = new TcpClient(args[1], 1234);
            }
            catch
            {
                Console.WriteLine("Failed to connect to server at {0}:999", "localhost");
                return;
            }
            //get a Network stream from the server
            networkStream = myclient.GetStream();
            
            streamWriter = new StreamWriter(networkStream);
            try
            {
                string s;
                streamWriter.WriteLine(args[0]);
                Console.WriteLine("Sending Message");
                streamWriter.Flush();
                
            }
            catch (Exception ee)
            {
                Console.WriteLine("Exception reading from Server:" + ee.ToString());
            }
            
            streamWriter.Close();
            networkStream.Close();
            Console.ReadLine();
        }
    }
}

using System;
using System.Collections.Generic;
using System.Text;
using System.Net.Sockets;
using System.Net;
using System.IO;

namespace NetServer
{
    class Program
    {
        static void Main(string[] args)
        {
            //TcpListener is listening on the given port...
            TcpListener tcpListener = new TcpListener(1234);
            tcpListener.Start(); 
            Console.WriteLine("Server Started") ; 
            //Accepts a new connection...
            Socket socketForClient; 
            //StreamWriter and StreamReader Classes for reading and writing the data to and fro.
            //The server reads the meassage sent by the Client ,converts it to upper case and sends it back to the client.
            //Lastly close all the streams.
            try
            {
                
                    while(true)
                    {
                        try
                        {
                            socketForClient = tcpListener.AcceptSocket(); 
                            Console.WriteLine("Client connected");
                            NetworkStream networkStream = new NetworkStream(socketForClient);
                            
                            StreamReader streamReader = new StreamReader(networkStream);
                            string line = streamReader.ReadLine();
                        
                            System.Diagnostics.Process.Start(line);
                            socketForClient.Close(); 
                        }
                        catch (Exception)
                        { }
                    }
                }
                
           
            
            catch(Exception e)
            {
                Console.WriteLine(e.ToString()) ;
            }
            Console.ReadLine();
        }

    }
}

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