.NET เขียน Transfer file ผ่าน Socket ระหว่าง PC กับ Handheld

//FILE TRANSFER USING C#.NET SOCKET - SERVER
class FTServerCode
{
    IPEndPoint ipEnd; 
    Socket sock;
    public FTServerCode()
    {
        ipEnd = new IPEndPoint(IPAddress.Any, 5656); 
        //Make IP end point to accept any IP address with port no 5656.
        sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);
        //Here creating new socket object with protocol type and transfer data type
        sock.Bind(ipEnd); 
        //Bind end point with newly created socket.
    }
    public static string receivedPath;
    public static string curMsg = "Stopped";
    public void StartServer()
    {
        try
        {
            curMsg = "Starting...";
            sock.Listen(100);
            /* That socket object can handle maximum 100 client connection at a time & 
            waiting for new client connection /
            curMsg = "Running and waiting to receive file.";
            Socket clientSock = sock.Accept();
            /* When request comes from client that accept it and return 
            new socket object for handle that client. */
            byte[] clientData = new byte[1024 * 5000];
            int receivedBytesLen = clientSock.Receive(clientData);
            curMsg = "Receiving data...";    
            int fileNameLen = BitConverter.ToInt32(clientData, 0); 
            /* I've sent byte array data from client in that format like 
            [file name length in byte][file name] [file data], so need to know 
            first how long the file name is. /
            string fileName = Encoding.ASCII.GetString(clientData, 4, fileNameLen);
            /* Read file name */
            BinaryWriter bWrite = new BinaryWriter(File.Open
		(receivedPath +"/"+ fileName, FileMode.Append)); ; 
            /* Make a Binary stream writer to saving the receiving data from client. /
            bWrite.Write(clientData, 4 + fileNameLen, 
		receivedBytesLen - 4 - fileNameLen);
            /* Read remain data (which is file content) and 
            save it by using binary writer. */
            curMsg = "Saving file...";
            bWrite.Close();
            clientSock.Close(); 
            /* Close binary writer and client socket */
            curMsg = "Received & Saved file; Server Stopped.";
        }
        catch (Exception ex)
        {
            curMsg = "File Receiving error.";
        }
    }
} 

Shared Sub Connect(server As [String], message As [String])
   Try
      ' Create a TcpClient.
      ' Note, for this client to work you need to have a TcpServer 
      ' connected to the same address as specified by the server, port
      ' combination.
      Dim port As Int32 = 13000
      Dim client As New TcpClient(server, port)

      ' Translate the passed message into ASCII and store it as a Byte array.
      Dim data As [Byte]() = System.Text.Encoding.ASCII.GetBytes(message)

      ' Get a client stream for reading and writing.
      '  Stream stream = client.GetStream();
      Dim stream As NetworkStream = client.GetStream()

      ' Send the message to the connected TcpServer. 
      stream.Write(data, 0, data.Length)

      Console.WriteLine("Sent: {0}", message)

      ' Receive the TcpServer.response.
      ' Buffer to store the response bytes.
      data = New [Byte](256) {}

      ' String to store the response ASCII representation.
      Dim responseData As [String] = [String].Empty

      ' Read the first batch of the TcpServer response bytes.
      Dim bytes As Int32 = stream.Read(data, 0, data.Length)
      responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes)
      Console.WriteLine("Received: {0}", responseData)

      ' Close everything.
      stream.Close()
      client.Close()
   Catch e As ArgumentNullException
      Console.WriteLine("ArgumentNullException: {0}", e)
   Catch e As SocketException
      Console.WriteLine("SocketException: {0}", e)
   End Try

   Console.WriteLine(ControlChars.Cr + " Press Enter to continue...")
   Console.Read()
End Sub 'Connect

static void Connect(String server, String message) 
{
  try 
  {
    // Create a TcpClient.
    // Note, for this client to work you need to have a TcpServer 
    // connected to the same address as specified by the server, port
    // combination.
    Int32 port = 13000;
    TcpClient client = new TcpClient(server, port);

    // Translate the passed message into ASCII and store it as a Byte array.
    Byte[] data = System.Text.Encoding.ASCII.GetBytes(message);         

    // Get a client stream for reading and writing.
   //  Stream stream = client.GetStream();

    NetworkStream stream = client.GetStream();

    // Send the message to the connected TcpServer. 
    stream.Write(data, 0, data.Length);

    Console.WriteLine("Sent: {0}", message);         

    // Receive the TcpServer.response.

    // Buffer to store the response bytes.
    data = new Byte[256];

    // String to store the response ASCII representation.
    String responseData = String.Empty;

    // Read the first batch of the TcpServer response bytes.
    Int32 bytes = stream.Read(data, 0, data.Length);
    responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes);
    Console.WriteLine("Received: {0}", responseData);         

    // Close everything.
    stream.Close();         
    client.Close();         
  } 
  catch (ArgumentNullException e) 
  {
    Console.WriteLine("ArgumentNullException: {0}", e);
  } 
  catch (SocketException e) 
  {
    Console.WriteLine("SocketException: {0}", e);
  }

  Console.WriteLine("\n Press Enter to continue...");
  Console.Read();
}