Client / Server multi threaded using TCP Listener and Streamreader / writer

Question

I've been asked to write a Client / Server application in C#, and have been given half-completed code to get started.

It uses the ThreadPool , and TcpListener with StreamReader and StreamWriter classes for data transfer.The client has a working directory, which is fixed. The server has one too, but can change.

Basically, you type in an option on the client using a switch statement, and the server processes that option and sends it back to the client.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;
using System.IO;
using System.Security.Cryptography;

namespace Client
{
/// <summary>
/// Remote File Service client
/// </summary>
class Client
{
    /// <summary>
    /// Static entry point to client code
    /// </summary>
    /// <param name="args">unused</param>
    static void Main(string[] args)
    {
        string dir = @"c:\st12_13d1_files";

        try
        {
            Directory.SetCurrentDirectory(dir);
        }
        catch (DirectoryNotFoundException e)
        {
            Console.WriteLine("The specified directory does not exist. {0}", e);
        }

        try
        {
            using (TcpClient client = new TcpClient("localhost", 50012))
            using (NetworkStream stream = client.GetStream())
            using (StreamReader reader = new StreamReader(stream))
            using (StreamWriter writer = new StreamWriter(stream))
            {
                writer.AutoFlush = true;
                string option;

                do
                {
                    Console.WriteLine("-Menu-\n");

                    Console.WriteLine("1-Print out file names-\n");
                    Console.WriteLine("2-Current Working Directory-\n");
                    Console.WriteLine("3-Files Present on the Server-\n");
                    Console.WriteLine("4- List of Subdirectory Names-\n");
                    Console.WriteLine("5- Change Server Directory Location-\n");
                    Console.WriteLine("6-Copy the contents of a file specified-\n");
                    Console.WriteLine("7-Close-\n");

                    Console.WriteLine("Please enter your choice: ");

                    option = Console.ReadLine();

                    switch (option)
                    {
                        case "1":
                        case "one":

                        Console.WriteLine("You have selected Print out file names: ");

                        break;
                    } 

using System;
using System.Net;
using System.Net.Sockets;
using System.IO;
using System.Text;
using System.Threading;
using System.Security.Cryptography;

namespace Server
{
/// <summary>
/// Remote File Service main functionality
/// </summary>
public class ServerMainline
{
    public ServerMainline()
    {
        /*
        * *** TO DO - your code goes here ***
        * record initial current working directory value in a global variable
        */

        string serv = (@"..\..");        

        try
        {
            //Set the current directory.
            Directory.SetCurrentDirectory(serv);
        }
        catch (DirectoryNotFoundException e)
        {
            Console.WriteLine("The specified directory does not exist. {0}", e);
        }

        TcpListener server = null;
        try
        {
            ThreadPool.SetMaxThreads(50, 50);

            server = new TcpListener(IPAddress.Any, 50012);
            server.Start();

            while (true)
            {

                Console.WriteLine("Waiting for a new Client...");
                TcpClient client = server.AcceptTcpClient();

                ThreadPool.QueueUserWorkItem(serviceClient, client);
            }
        }
        catch (Exception e)
        {
            Console.WriteLine("Server mainline: SocketException: {0}", e);
        }
        finally
        {
            server.Stop();
            server.Server.Close();
        }
    }

    /// <summary>
    /// method to run to handle each client on separate thread
    /// </summary>
    void serviceClient(object clientObject)
    {
        Thread currentThread = Thread.CurrentThread;
        int threadID = currentThread.GetHashCode();    

        try
        {
            using (TcpClient client = (TcpClient)clientObject)
            using (NetworkStream stream = client.GetStream())
            using (StreamReader reader = new StreamReader(stream))
            using (StreamWriter writer = new StreamWriter(stream))
            {
                writer.AutoFlush = true;
                Console.WriteLine("Connected with a client, threadID: {0}", threadID);

                string option = reader.ReadLine();

                while (option != "7")

                switch (option)
                {
                 case "1":
                 case "one":

                 string[] myfiles = Directory.GetFiles(@"c:\st12_13d1_files");
                 Console.WriteLine("File Names {0}",Directory.GetFiles
                 (@"c:\st12_13d1_files"));
                        foreach (string file in myfiles)
                        {
                          //Console.WriteLine(file);
                          Console.WriteLine(Path.GetFileName(file));
                          writer.WriteLine(myfiles);
                        }

                        break;

                       }

Answer 1

With all due respect, I don't think it's appropriate to ask others to complete your homework assignments for you.

As a student, it should be your job to research (there are any number of TCP socket demos and tutorials on the web) and experiment with several solutions before resorting to asking others for help.

Software development is as much art as it is science and it requires that you spend time practicing your art. You cannot learn to be a great programmer by reading books and having others do your work for you.

Voting to close.

Update: Not wanting to be a complete curmudgeon, here are some links to some tutorials that should help you really get to grips with async TCP/socket programming:

• Learn C# Socket Programming
• What is a good tutorial/howto on .net / c# socket programming