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    <p>Yes, the client can only connect to the port. Then, the Server may respond back to the client's connection </p> <p><img src="https://i.stack.imgur.com/uKIb7.png" alt="Client-Server Request and its response"></p> <p><strong>Example</strong></p> <p><sup><strong>Client</strong></sup></p> <pre><code>IPEndPoint ip = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9999); Socket server = new Socket(AddressFamily.InterNetwork,SocketType.Stream, ProtocolType.Tcp); try { server.Connect(ip); //Connect to the server } catch (SocketException e){ Console.WriteLine("Unable to connect to server."); return; } Console.WriteLine("Type 'exit' to exit."); while(true) { string input = Console.ReadLine(); if (input == "exit") break; server.Send(Encoding.ASCII.GetBytes(input)); //Encode from user's input, send the data byte[] data = new byte[1024]; int receivedDataLength = server.Receive(data); //Wait for the data string stringData = Encoding.ASCII.GetString(data, 0, receivedDataLength); //Decode the data received Console.WriteLine(stringData); //Write the data on the screen } server.Shutdown(SocketShutdown.Both); server.Close(); </code></pre> <p>This will allow the client to send data to the server. Then, wait for the response from the server. However, if the server does not respond back the client will hang on for much time.</p> <p><strong>Here's an example from the server</strong></p> <pre><code>IPEndPoint ip = new IPEndPoint(IPAddress.Any,9999); //Any IPAddress that connects to the server on any port Socket socket = new Socket(AddressFamily.InterNetwork,SocketType.Stream, ProtocolType.Tcp); //Initialize a new Socket socket.Bind(ip); //Bind to the client's IP socket.Listen(10); //Listen for maximum 10 connections Console.WriteLine("Waiting for a client..."); Socket client = socket.Accept(); IPEndPoint clientep =(IPEndPoint)client.RemoteEndPoint; Console.WriteLine("Connected with {0} at port {1}",clientep.Address, clientep.Port); string welcome = "Welcome"; //This is the data we we'll respond with byte[] data = new byte[1024]; data = Encoding.ASCII.GetBytes(welcome); //Encode the data client.Send(data, data.Length,SocketFlags.None); //Send the data to the client Console.WriteLine("Disconnected from {0}",clientep.Address); client.Close(); //Close Client socket.Close(); //Close socket </code></pre> <p>This will allow the server to send a response back to the client upon the client's connection.</p> <p>Thanks, <br>I hope you find this helpful :)</p>
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    1. COi get it. but what if the server needs to send data, without the client to whait for RESPONSE ?
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    2. COi mean : one client is typing " hi everybody ", so the server gets thsi message and sends it to all the other clients, but if one client doesnt have typed anything befor, they are not waiting for the response.. do you know what i mean ?
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    3. CO@Ace Yes. The server has the opportunity to respond only if there were data sent by the client. It has also the opportunity to respond to the client after the client is connected.
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