socket programming problem to chat between two pc in .net

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.NET

Dear All,

I am developing a chat application in .net.
it worked well on localhost. but when i am trying to work on two pc it is not working.
please help me to solve this problem.

this code is to get data from server.

private void btnGetMsg_Click(object sender, EventArgs e)
        {
            
            IPHostEntry ipHostInfo = Dns.Resolve("192.168.1.6");
            IPAddress ipAddress = ipHostInfo.AddressList[0];
            IPEndPoint remoteEP = new IPEndPoint(ipAddress, 1000);
            TcpClient c = new TcpClient(remoteEP);
            int aa = c.ReceiveBufferSize;
            NetworkStream ns = c.GetStream(); //get stream
            byte[] buf = new byte[100]; //create byte array to receive data
            ns.Read(buf, 0, 100);  // read data from stream into byte array
            string st = System.Text.Encoding.ASCII.GetString(buf); // convert byte array to string
            if (st != "")
            {
                listBox1.Items.Add(string.Concat("Server Said: ", st));
            }
        }

this code is to send data for client.

private void button2_Click(object sender, EventArgs e)
      {

          TcpListener l = new TcpListener(1000);
          l.Start();   // start listener

          TcpClient c = l.AcceptTcpClient();   // wait for client to make request
          NetworkStream ns = c.GetStream();  // access steam to send data to client.

          string st = textBox1.Text;   // get system date and convert it to string

          listBox1.Items.Add(string.Concat("Server Said: ", textBox1.Text));
          byte[] buf = System.Text.Encoding.ASCII.GetBytes(st);  // convert string to an array of bytes
          ns.Write(buf, 0, st.Length);  // write to stream
          l.Stop();

      }