C#

client:-

 private void sendButton_Click(object sender, EventArgs e)
        {            
            TcpClient socketForServer;
            try
            {
                socketForServer = new TcpClient(_ip of sending machine , 10);  
               
            }
            catch
            {
                MessageBox.Show("Failed to connect to server at {0}:999", _machineName); 
                return;
            }
            NetworkStream networkStream = socketForServer.GetStream();            
            System.IO.StreamWriter streamWriter =
            new System.IO.StreamWriter(networkStream);
            System.IO.StreamReader streamReader =
            new System.IO.StreamReader(networkStream);
            try
            {
                streamWriter.WriteLine(this.messageTextBox.Text);                    
                streamWriter.Flush();
                this.messageTextBox.Clear();
                this.messageTextBox.ReadOnly = true; 
                this.messageTextBox.Text = streamReader.ReadLine(); 
             
            }
            catch
            {
                MessageBox.Show("Exception reading from Server");  
            }
            // tidy up
            networkStream.Close();            

        }

Server:-

TcpListener tcpListener = new TcpListener(10);            
            tcpListener.Start();                       

            while (true)
            {
                Socket socketForClient = tcpListener.AcceptSocket();                
                NetworkStream networkStream = new NetworkStream(socketForClient);                
                System.IO.StreamReader streamReader =
                new System.IO.StreamReader(networkStream);               
                string theString = streamReader.ReadLine();
                MessageBox.Show(theString);  //message recieved how to send this back to local host           
                streamReader.Close();
                networkStream.Close();
                socketForClient.Close();
            }