GUI based Tcp Client : Socket Client : Network C# Examples

    
/*
Quote  from  

C#  Network  Programming
#  Paperback:  656  pages
#  Publisher:  Sybex  (November  26,  2002)
#  Language:  English
#  ISBN-10:  0782141765
#  ISBN-13:  978-0782141764
*/
using  System;
using  System.Drawing;
using  System.Net;
using  System.Net.Sockets;
using  System.Text;
using  System.Windows.Forms;

public  class  AsyncTcpClient  :  Form
{
      private  TextBox  newText;
      private  TextBox  conStatus;
      private  ListBox  results;
      private  Socket  client;
      private  byte[]  data  =  new  byte[1024];
      private  int  size  =  1024;

      public  AsyncTcpClient()
      {
            Text  =  "Asynchronous  TCP  Client";
            Size  =  new  Size(400,  380);
            
            Label  label1  =  new  Label();
            label1.Parent  =  this;
            label1.Text  =  "Enter  text  string:";
            label1.AutoSize  =  true;
            label1.Location  =  new  Point(10,  30);

            newText  =  new  TextBox();
            newText.Parent  =  this;
            newText.Size  =  new  Size(200,  2  *  Font.Height);
            newText.Location  =  new  Point(10,  55);

            results  =  new  ListBox();
            results.Parent  =  this;
            results.Location  =  new  Point(10,  85);
            results.Size  =  new  Size(360,  18  *  Font.Height);

            Label  label2  =  new  Label();
            label2.Parent  =  this;
            label2.Text  =  "Connection  Status:";
            label2.AutoSize  =  true;
            label2.Location  =  new  Point(10,  330);

            conStatus  =  new  TextBox();
            conStatus.Parent  =  this;
            conStatus.Text  =  "Disconnected";
            conStatus.Size  =  new  Size(200,  2  *  Font.Height);
            conStatus.Location  =  new  Point(110,  325);

            Button  sendit  =  new  Button();
            sendit.Parent  =  this;
            sendit.Text  =  "Send";
            sendit.Location  =  new  Point(220,52);
            sendit.Size  =  new  Size(5  *  Font.Height,  2  *  Font.Height);
            sendit.Click  +=  new  EventHandler(ButtonSendOnClick);

            Button  connect  =  new  Button();
            connect.Parent  =  this;
            connect.Text  =  "Connect";
            connect.Location  =  new  Point(295,  20);
            connect.Size  =  new  Size(6  *  Font.Height,  2  *  Font.Height);
            connect.Click  +=  new  EventHandler(ButtonConnectOnClick);

            Button  discon  =  new  Button();
            discon.Parent  =  this;
            discon.Text  =  "Disconnect";
            discon.Location  =  new  Point(295,52);
            discon.Size  =  new  Size(6  *  Font.Height,  2  *  Font.Height);
            discon.Click  +=  new  EventHandler(ButtonDisconOnClick);
      }

      void  ButtonConnectOnClick(object  obj,  EventArgs  ea)
      {
            conStatus.Text  =  "Connecting...";
            Socket  newsock  =  new  Socket(AddressFamily.InterNetwork,
                                                        SocketType.Stream,  ProtocolType.Tcp);
            IPEndPoint  iep  =  new  IPEndPoint(IPAddress.Parse("127.0.0.1"),  9050);
            newsock.BeginConnect(iep,  new  AsyncCallback(Connected),  newsock);
      }

      void  ButtonSendOnClick(object  obj,  EventArgs  ea)
      {
            byte[]  message  =  Encoding.ASCII.GetBytes(newText.Text);
            newText.Clear();
            client.BeginSend(message,  0,  message.Length,  SocketFlags.None,  new  AsyncCallback(SendData),  client);
      }

      void  ButtonDisconOnClick(object  obj,  EventArgs  ea)
      {
            client.Close();
            conStatus.Text  =  "Disconnected";
      }

      void  Connected(IAsyncResult  iar)
      {
            client  =  (Socket)iar.AsyncState;
            try
            {
                  client.EndConnect(iar);
                  conStatus.Text  =  "Connected  to:  "  +  client.RemoteEndPoint.ToString();
                  client.BeginReceive(data,  0,  size,  SocketFlags.None,
                                              new  AsyncCallback(ReceiveData),  client);
            }  catch  (SocketException)
            {
                  conStatus.Text  =  "Error  connecting";
            }
      }

      void  ReceiveData(IAsyncResult  iar)
      {
            Socket  remote  =  (Socket)iar.AsyncState;
            int  recv  =  remote.EndReceive(iar);
            string  stringData  =  Encoding.ASCII.GetString(data,  0,  recv);
            results.Items.Add(stringData);
      }

      void  SendData(IAsyncResult  iar)
      {
            Socket  remote  =  (Socket)iar.AsyncState;
            int  sent  =  remote.EndSend(iar);
            remote.BeginReceive(data,  0,  size,  SocketFlags.None,new  AsyncCallback(ReceiveData),  remote);
      }

      public  static  void  Main()
      {
            Application.Run(new  AsyncTcpClient());
      }
}