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byte[] filenameByte = Encoding.UTF8.GetBytes(filename);
            server.Send(filenameByte);
            byte[] operationByte = new byte[2];
            server.Receive(operationByte);
            int operation = BitConverter.ToInt16(operationByte, 0);
            Console.WriteLine("Received operation: --{0}--", operation.ToString());
            if (operation == 1)
            {
                Console.WriteLine("Operation succeeded: {0}\r\nFilePath: {1}", operation.ToString(), onlypath + filename);
                FileStream fs = new FileStream(onlypath + filename, FileMode.Open);
                byte[] fileSendByte = new byte[length];
                while (fs.Read(fileSendByte, 0, length) == 0)
                {
                    Console.WriteLine("Send: {0}", Convert.ToString(fileSendByte.Length));
                    server.Send(fileSendByte);
                }
                fs.Close();
                server.Close();
            }
            else if (operation == 0)
            {
                Console.WriteLine(operation + "\r\n");
                server.Close();
            }                    

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byte[] filenameByte = new byte[1024];
            clientSocket.Receive(filenameByte);
            string filename = Encoding.ASCII.GetString(filenameByte);
            Console.WriteLine("---" + filename + "---");
            string filepath = Model.LFS.saveFile(filename);
            if (filepath != "")
            {
                filepath.Replace('\\', '/');
                Console.WriteLine(filepath);
                byte[] operationByte = BitConverter.GetBytes(1);
                clientSocket.Send(operationByte);
                byte[] fileReceiveByte = new byte[length];
                FileStream fs = new FileStream(filepath, FileMode.Append, FileAccess.ReadWrite);
                while (true)
                {
                    clientSocket.Receive(fileReceiveByte);
                    Console.WriteLine("Receive: {0}", Convert.ToString(fileReceiveByte.Length));
                    fs.Write(fileReceiveByte, 0, length);
                    if (fileReceiveByte.Length == 0)
                    {
                        break;
                    }
                }
                fs.Close();
            }
            else
            {
                Console.WriteLine("Canceled");
                byte[] operationByte = BitConverter.GetBytes(0);
                clientSocket.Send(operationByte);
            }
            clientSocket.Shutdown(SocketShutdown.Both);                    

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internal int length = 1024 * 50000;                    

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