// Establish the local endpoint for the socket.
     IPHostEntry ipHost = Dns.GetHostEntry(Dns.GetHostName());
     IPAddress  ipAddr = ipHost.AddressList[0];
     IPEndPoint ipEndPoint = new IPEndPoint(ipAddr, 11000);

     // Create a TCP socket.
     Socket client = new Socket(AddressFamily.InterNetwork,
             SocketType.Stream, ProtocolType.Tcp);

     // Connect the socket to the remote endpoint.
     client.Connect(ipEndPoint);

     // Send file fileName to the remote host with preBuffer and postBuffer data.
     // There is a text file test.txt located in the root directory.
     string fileName = "C:\\test.txt";

     // Create the preBuffer data.
     string string1 = String.Format("This is text data that precedes the file.{0}", Environment.NewLine);
     byte[] preBuf = Encoding.ASCII.GetBytes(string1);

     // Create the postBuffer data.
     string string2 = String.Format("This is text data that will follow the file.{0}", Environment.NewLine);
     byte[] postBuf = Encoding.ASCII.GetBytes(string2);

     //Send file fileName with buffers and default flags to the remote device.
     Console.WriteLine("Sending {0} with buffers to the host.{1}", fileName, Environment.NewLine);
     client.SendFile(fileName, preBuf, postBuf, TransmitFileOptions.UseDefaultWorkerThread);

     // Release the socket.
     client.Shutdown(SocketShutdown.Both);
     client.Close();