tcp:sendfile-server src sample

using System;  
using System.Collections.Generic;  
using System.Net;  
using System.Net.Sockets;  
using System.IO;  
using System.Text;  
 
namespace FileTransfer  
{  
    class Program  
    {  
        static void Main(string[] args)  
        {  
            // Listen on port 31234    
            TcpListener tcpListener = new TcpListener(IPAddress.Any, 31234);  
            tcpListener.Start();  
 
            Console.WriteLine("Server started");  
 
            //Infinite loop to connect to new clients    
            while (true)  
            {  
                // Accept a TcpClient    
                TcpClient tcpClient = tcpListener.AcceptTcpClient();  
 
                Console.WriteLine("Connected to client");  
 
                StreamReader reader = new StreamReader(tcpClient.GetStream());  
 
                // The first message from the client is the file size    
                string cmdFileSize = reader.ReadLine();  
 
                // The first message from the client is the filename    
                string cmdFileName = reader.ReadLine() + "_1";  
 
                int length = Convert.ToInt32(cmdFileSize);  
                byte[] buffer = new byte[length];  
                int received = 0;  
                int read = 0;  
                int size = 1024;  
                int remaining = 0;  
 
                // Read bytes from the client using the length sent from the client    
                while (received < length)  
                {  
                    remaining = length - received;  
                    if (remaining < size)  
                    {  
                        size = remaining;  
                    }  
 
                    read = tcpClient.GetStream().Read(buffer, received, size);  
                    received += read;  
                }  
 
                // Save the file using the filename sent by the client    
                using (FileStream fStream = new FileStream(Path.GetFileName(cmdFileName), FileMode.Create))  
                {  
                    fStream.Write(buffer, 0, buffer.Length);  
                    fStream.Flush();  
                    fStream.Close();  
                }  
 
                Console.WriteLine("File received and saved in " + Environment.CurrentDirectory);  
            }  
        }  
    }  
}