class Program
    {
const int BufferSize = 1024;
static string path = @"E:\";
static void Main(string[] args)
        {
            IPEndPoint ip = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8080);
            Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            sock.Bind(ip);
            sock.Listen(1);
            Console.WriteLine("Begin listen...");

while (true)
            {
                Socket client = sock.Accept();
if (client.Connected)
                {
                    Thread cThread = new Thread(new ParameterizedThreadStart(myClient));
                    cThread.IsBackground = true;
                    cThread.Start(client);
                }
            }
        }

static void myClient(object oSocket)
        {
            Socket clientSocket = (Socket)oSocket;
string clientName = clientSocket.RemoteEndPoint.ToString();
            Console.WriteLine("新来一个客户:" + clientName);         
try
            {
while (true)
                {
byte[] buffer = new byte[BufferSize];
int count = clientSocket.Receive(buffer);
                    Console.WriteLine("收到" + clientName + ":" + Encoding.Default.GetString(buffer, 0, count));
string[] command = Encoding.Default.GetString(buffer, 0, count).Split(',');
string fileName;
long length;
if (command[0] == "namelength")
                    {
                        fileName = command[1];
                        length = Convert.ToInt64(command[2]);
                        clientSocket.Send(Encoding.Default.GetBytes("OK"));
long receive = 0L;
                        Console.WriteLine("Receiveing file:" + fileName + ".Plz wait...");
using (FileStream writer = new FileStream(Path.Combine(path, fileName), FileMode.Create, FileAccess.Write, FileShare.None))
                        {
int received;
while (receive < length)
                            {
                                received = clientSocket.Receive(buffer);
                                writer.Write(buffer, 0, received);
                                writer.Flush();
                                receive += (long)received;
                            }
                        }
                        Console.WriteLine("Receive finish.\n");
                    }
                }
            }
catch
            {
                Console.WriteLine("客户:" + clientName + "退出");
            }

        }
    }

    class Program
    {
static Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);        
static void Main(string[] args)
        {         
            sock.Connect(new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8080));
            Console.WriteLine("Connect successfully");
while (true)
            {
                Console.WriteLine("please input the path of the file which you want to send：");
string path = Console.ReadLine();
try
                {
using (FileStream reader = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.None))
                    {
long send = 0L, length = reader.Length;
string sendStr = "namelength," + Path.GetFileName(path) + "," + length.ToString();

string fileName = Path.GetFileName(path);
                        sock.Send(Encoding.Default.GetBytes(sendStr));

int BufferSize = 1024;
byte[] buffer = new byte[32];
                        sock.Receive(buffer);
string mes = Encoding.Default.GetString(buffer);

if (mes.Contains("OK"))
                        {
                            Console.WriteLine("Sending file:" + fileName + ".Plz wait...");
byte[] fileBuffer = new byte[BufferSize];
int read, sent;
while ((read = reader.Read(fileBuffer, 0, BufferSize)) != 0)
                            {
                                sent = 0;
while ((sent += sock.Send(fileBuffer, sent, read, SocketFlags.None)) < read)
                                {
                                    send += (long)sent;
                                }
                            }
                            Console.WriteLine("Send finish.\n");
                        }
                    }
                }
catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
            }
        }
    }