Code explaining

Hi to all you .. i found a code that has a client and a server.. and i can connect to server than read , or download or upload files... but i dont understand very good the all of the code..
from the METOD " //Metoda per dergim te te dhenave te serveri " and down can someone explain me the code .. thankyou very much ... and this is the Client part-CODE..

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

namespace ProgSistFileClient
{
class Program
{
static void Main(string[] args)
{
if (!Directory.Exists(Program.m_clientPath))
{
Directory.CreateDirectory(Program.m_clientPath);
}

Program p = new Program();
p.Connect();
Thread th = new Thread(p.Listening);
th.Start();
p.Puno();
}

//show fajllat qe gjenden ne folder
private const string Show = "show";
//shkarko + pathi
private const string Shkarko = "shkarko ";
//ngarko + pathi
private const string Ngarko = "ngarko ";

//formati i komunikimit
private const char Komand = 'c';
private const char EmriFile = 'f';

private const char Data = 'd';
private const char Message = 'm';

private TcpClient m_tcpClient;
private NetworkStream m_networkStream;
private static string m_clientPath = @"D:\ProgSistClientFolder";

private string m_shkarkoFileName = "";
private string m_ngarkoFileName = "";

//Metoda per tu lidhur me server
public bool Connect()
{
try
{
m_tcpClient = new TcpClient();
m_tcpClient.Connect("127.0.0.1", 7980);
m_networkStream = m_tcpClient.GetStream();
}
catch (Exception ex)
{
Console.WriteLine("not WORKING...");
Environment.Exit(0);
return false;

}
return true;
}

private void Puno()
{
string komanda = "";

while (komanda != "quit")
{
Console.WriteLine("Shkruaj komanden");
komanda = Console.ReadLine();

byte[] bufferKomanda = Encoding.ASCII.GetBytes(komanda);

//nese u shtyp show
if (komanda == Show)
{
//dergo kerkese tek serveri me kete komand
Send(Komand, bufferKomanda);
}
//nese fjala qe u shtyp eshte ma e madhe se 8 (shkarko )
else if (komanda.Length > 8)
{
//nese 8 charachteret e para jane (shkarko )
if (komanda.Substring(0, 8) == Shkarko)
{
m_shkarkoFileName = komanda.Substring(8);
//dergo kerkese te serveri per me shkarku nje file
Send(Komand, bufferKomanda);
}

if (komanda.Length > 7)
{
if (komanda.Substring(0, 7) == Ngarko)
{
m_ngarkoFileName = komanda.Substring(7);
Send(Komand, bufferKomanda);
if (NgarkoFile(m_ngarkoFileName) == false)
Console.WriteLine("===== Fajlli nuk ekziston =====");

else if (komanda == "exit")
{
Console.Clear();
Environment.Exit(0);
}
}
}
}
else if (komanda == "exit")
{
Console.Clear();
Environment.Exit(0);
}
else
{
Console.WriteLine("===== Komande e gabuar =====");
}
if (komanda.Length > 5)
{
if (komanda.Substring(0, 5) == "krijo")
{
Send(Komand, bufferKomanda);
}
else if (komanda.Substring(0, 5) == "fshij")
{
Send(Komand, bufferKomanda);
}
}
}
}

//Metoda per dergim te te dhenave te serveri
public bool Send(char tipi, byte[] buffer)
{
try
{
if (m_tcpClient.Connected)
{
byte[] tipiBuffer = BitConverter.GetBytes(tipi);
byte[] sendBuffer = new byte[buffer.Length + 2];

tipiBuffer.CopyTo(sendBuffer, 0);
buffer.CopyTo(sendBuffer, 2);

m_networkStream.Write(sendBuffer, 0, sendBuffer.Length);
}
else
{
return false;
}
}
catch (Exception ex)
{
return false;
}

return true;
}

//metoda qe e ndegjon sererin qka po kten
private void Listening()
{
try
{
while (m_tcpClient.Connected)
{
byte[] buffer = new byte[1024];
int readBytes = m_networkStream.Read(buffer, 0, buffer.Length - 1);

//Memory Stream per te ruajtur te dhenat
MemoryStream memoryStream = new MemoryStream();
memoryStream.Write(buffer, 0, readBytes);

char operations = BitConverter.ToChar(buffer, 0);

switch (operations)
{
case Komand:
string komanda = Encoding.ASCII.GetString(buffer, 2, readBytes - 2);
Console.WriteLine(Shfaq(buffer, readBytes - 2));
break;

case Data:
ShkarkoFile(buffer, readBytes);
break;

case Message:
string dataCommand = Encoding.ASCII.GetString(buffer, 2, readBytes - 2);

Console.WriteLine(ShfaqMesazhin(buffer, readBytes - 2));
break;
}

if (memoryStream != null)
memoryStream.Close();
}
}
catch (Exception ex)
{

}
}

private string Shfaq(byte[] buffer, int length)
{
return Encoding.ASCII.GetString(buffer, 2, length);
}

private string ShfaqMesazhin(byte[] buffer, int length)
{
return Encoding.ASCII.GetString(buffer, 2, length);
}

//e ruajme file-in qe na kteet prej sererit nese ekziston
private void ShkarkoFile(byte[] receivedDataBuffer, int readBytes)
{
FileStream fileStream = new FileStream(m_clientPath + @"\" + m_shkarkoFileName, FileMode.Create, FileAccess.Write);

fileStream.Write(receivedDataBuffer, 2, readBytes - 2);
fileStream.Close();
}

private bool NgarkoFile(string fileName)
{
bool check = false;

if (File.Exists(m_clientPath + @"\" + fileName))
{
FileStream fileStream = new FileStream(m_clientPath + @"\" + fileName, FileMode.Open, FileAccess.Read);

byte[] buffer = new byte[fileStream.Length];

fileStream.Read(buffer, 0, buffer.Length);

Send(Data, buffer);

fileStream.Close();
check = true;
}

return check;
}
}
}