GUI based Tcp Server : Socket Server : 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  AsyncTcpSrvr  :  Form
{
      private  TextBox  conStatus;
      private  ListBox  results;
      private  byte[]  data  =  new  byte[1024];
      private  int  size  =  1024;
      private  Socket  server;


      public  AsyncTcpSrvr()
      {
            Text  =  "Asynchronous  TCP  Server";
            Size  =  new  Size(400,  380);

            results  =  new  ListBox();
            results.Parent  =  this;
            results.Location  =  new  Point(10,  65);
            results.Size  =  new  Size(350,  20  *  Font.Height);

            Label  label1  =  new  Label();
            label1.Parent  =  this;
            label1.Text  =  "Text  received  from  client:";
            label1.AutoSize  =  true;
            label1.Location  =  new  Point(10,  45);

            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  =  "Waiting  for  client...";
            conStatus.Size  =  new  Size(200,  2  *  Font.Height);
            conStatus.Location  =  new  Point(110,  325);

            Button  stopServer  =  new  Button();
            stopServer.Parent  =  this;
            stopServer.Text  =  "Stop  Server";
            stopServer.Location  =  new  Point(260,32);
            stopServer.Size  =  new  Size(7  *  Font.Height,  2  *  Font.Height);
            stopServer.Click  +=  new  EventHandler(ButtonStopOnClick);

            server  =  new  Socket(AddressFamily.InterNetwork,
                                        SocketType.Stream,  ProtocolType.Tcp);
            IPEndPoint  iep  =  new  IPEndPoint(IPAddress.Any,  9050);
            server.Bind(iep);
            server.Listen(5);
            server.BeginAccept(new  AsyncCallback(AcceptConn),  server);
      }

      void  ButtonStopOnClick(object  obj,  EventArgs  ea)
      {
            Close();
      }

      void  AcceptConn(IAsyncResult  iar)
      {
            Socket  oldserver  =  (Socket)iar.AsyncState;
            Socket  client  =  oldserver.EndAccept(iar);
            conStatus.Text  =  "Connected  to:  "  +  client.RemoteEndPoint.ToString();
            string  stringData  =  "Welcome  to  my  server";
            byte[]  message1  =  Encoding.ASCII.GetBytes(stringData);
            client.BeginSend(message1,  0,  message1.Length,  SocketFlags.None,
                                    new  AsyncCallback(SendData),  client);
      }

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

      void  ReceiveData(IAsyncResult  iar)
      {
            Socket  client  =  (Socket)iar.AsyncState;
            int  recv  =  client.EndReceive(iar);
            if  (recv  ==  0)
            {
                  client.Close();
                  conStatus.Text  =  "Waiting  for  client...";
                  server.BeginAccept(new  AsyncCallback(AcceptConn),  server);
                  return;
            }
            string  receivedData  =  Encoding.ASCII.GetString(data,  0,  recv);
            results.Items.Add(receivedData);
            byte[]  message2  =  Encoding.ASCII.GetBytes(receivedData);
            client.BeginSend(message2,  0,  message2.Length,  SocketFlags.None,
                                      new  AsyncCallback(SendData),  client);
      }

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