Передача коротких сообщений между двумя компьютерами в Интернет

  try
            {
 
                IPAddress ipaLocal = IPAddress.Parse(IpAddress.Text);
                // If the TCP listener object was not created before, create it
                if (tlsServer == null)
                {
                    // Create the TCP listener object using the IP of the server and the specified port
                    tlsServer = new TcpListener(ipaLocal, Convert.ToInt32(txtPort.Text));
                }
                // Write the status to the log textbox on the form (txtLog)
                this.Invoke(new UpdateStatusCallback(this.UpdateStatus), new object[] { "Starting the server...\r\n" });
                // Start the TCP listener and listen for connections
                tlsServer.Start();
                // Write the status to the log textbox on the form (txtLog)
                this.Invoke(new UpdateStatusCallback(this.UpdateStatus), new object[] { "The server has started. Please connect the client to " + ipaLocal.ToString() + "\r\n" });
                // Accept a pending connection
                TcpClient tclServer = tlsServer.AcceptTcpClient();
                // Write the status to the log textbox on the form (txtLog)
                this.Invoke(new UpdateStatusCallback(this.UpdateStatus), new object[] { "The server has accepted the client\r\n" });
                // Receive the stream and store it in a NetworkStream object
                strRemote = tclServer.GetStream();
                // Write the status to the log textbox on the form (txtLog)
                this.Invoke(new UpdateStatusCallback(this.UpdateStatus), new object[] { "The server has received the stream\r\n" });
                // For holding the number of bytes we are reading at one time from the stream
                int bytesSize = 0;
                // The buffer that holds the data received from the client
                byte[] downBuffer = new byte[2048];
                // Read the first buffer (2048 bytes) from the stream - which represents the file name
                bytesSize = strRemote.Read(downBuffer, 0, 2048);
                // Convert the stream to string and store the file name
                string FileName = System.Text.Encoding.ASCII.GetString(downBuffer, 0, bytesSize);
                // Set the file stream to the path C:\ plus the name of the file that was on the sender's computer
                strLocal = new FileStream(@"C:\" + FileName, FileMode.Create, FileAccess.Write, FileShare.ReadWrite);
                // The buffer that holds the data received from the client
                downBuffer = new byte[2048];
                // Read the next buffer (2048 bytes) from the stream - which represents the file size
                bytesSize = strRemote.Read(downBuffer, 0, 2048);
                // Convert the file size from bytes to string and then to long (Int64)
                long FileSize = Convert.ToInt64(System.Text.Encoding.ASCII.GetString(downBuffer, 0, bytesSize));
                // Write the status to the log textbox on the form (txtLog)
                this.Invoke(new UpdateStatusCallback(this.UpdateStatus), new object[] { "Receiving file " + FileName + " (" + FileSize + " bytes)\r\n" });
                // The buffer size for receiving the file
                downBuffer = new byte[2048];
                // From now on we read everything that's in the stream's buffer because the file content has started
 
                while ((bytesSize = strRemote.Read(downBuffer, 0, downBuffer.Length)) > 0)
                {
                    // Write the data to the local file stream
                    strLocal.Write(downBuffer, 0, bytesSize);
                    // Update the progressbar by passing the file size and how much we downloaded so far to UpdateProgress()
                    this.Invoke(new UpdateProgressCallback(this.UpdateProgress), new object[] { strLocal.Length, FileSize });
                }
                // When this point is reached, the file has been received and stored successfuly
            }
 
            finally
            {
 
                // This part of the method will fire no matter wether an error occured in the above code or not
                // Write the status to the log textbox on the form (txtLog)
                this.Invoke(new UpdateStatusCallback(this.UpdateStatus), new object[] { "The file was received. Closing streams.\r\n" });
                // Close the streams
                strLocal.Close();
                strRemote.Close();
                // Write the status to the log textbox on the form (txtLog)
                this.Invoke(new UpdateStatusCallback(this.UpdateStatus), new object[] { "Streams are now closed.\r\n" });
                // Start the server (TCP listener) all over again
                StartReceiving();
 
            }