if condition in this program

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C#

Hi,

Can anyone tell me how can I use if condition in this program?

For example if client sends "hello" then server response is "hi" and if client send "how r u" then server send "i am fine".
I have this code and I am trying to do that, but it does not work.

Server program

 public Socket workSocket = null;

           public const int BufferSize = 1024;

            public byte[] buffer = new byte[BufferSize];

            public StringBuilder sb = new StringBuilder();

        }
        public class AsynchronousSocketListener
        {

            public static ManualResetEvent allDone = new ManualResetEvent(false);

public AsynchronousSocketListener()
            {

            }



            public static void StartListening()
            {

                byte[] bytes = new Byte[1024];

                IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());

                IPAddress ipAddress = ipHostInfo.AddressList[0];

                IPEndPoint localEndPoint = new IPEndPoint(ipAddress, 8888);

                Socket listener = new Socket(AddressFamily.InterNetwork,SocketType.Stream, ProtocolType.Tcp);


                try
                {

                    listener.Bind(localEndPoint);

                    listener.Listen(100);



                    while (true)
                    {

                        allDone.Reset();


                        Console.WriteLine("Waiting for a connection...");

                        listener.BeginAccept(new AsyncCallback(AcceptCallback),listener);


                        allDone.WaitOne();

                    }



                }
                catch (Exception e)
                {

                    Console.WriteLine(e.ToString());

                }



                Console.WriteLine("\nPress ENTER to continue...");

                Console.Read();

            }



            public static void AcceptCallback(IAsyncResult ar)
            {

                allDone.Set();


                Socket listener = (Socket)ar.AsyncState;

                Socket handler = listener.EndAccept(ar);


                StateObject state = new StateObject();

                state.workSocket = handler;

                handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,new AsyncCallback(ReadCallback), state);

            }



            public static void ReadCallback(IAsyncResult ar)
            {

                String content = String.Empty;


                StateObject state = (StateObject)ar.AsyncState;

                Socket handler = state.workSocket;


                int bytesRead  = handler.EndReceive(ar);



                if (bytesRead > 0)
                {


                    state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));




                    content = state.sb.ToString();

                    if (content.IndexOf("<eof>") > -1)
                    {
                        if (content == "hello")
                        {
                            Console.WriteLine(content);
                            Send(handler, content);
                        }
                        else if (content == "How r u")
                        {
                            Console.WriteLine(content);
                            Send2(handler, content);
                        }
                    }
                    else
                    {

                        handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,new AsyncCallback(ReadCallback), state);

                    }
                    

                }

            }

            private static void Send(Socket handler, String data)
            {
                data = "Hi";

                byte[] byteData = Encoding.ASCII.GetBytes(data);

                handler.BeginSend(byteData, 0, byteData.Length, 0,new AsyncCallback(SendCallback), handler);

            }


            private static void Send2(Socket handler, String data)
            {
                data = "fine";

                byte[] byteData = Encoding.ASCII.GetBytes(data);




         handler.BeginSend(byteData, 0, byteData.Length, 0, new AsyncCallback(SendCallback), handler);

            }

            private static void SendCallback(IAsyncResult ar)
            {

                try
                {

                    Socket handler = (Socket)ar.AsyncState;

                    int bytesSent = handler.EndSend(ar);

                    handler.Shutdown(SocketShutdown.Both);     

                     handler.Close();



                }
                catch (Exception e)
                {

                    Console.WriteLine(e.ToString());

                }

            }


            public static int Main(String[] args)
            {

                StartListening();

                return 0;

            }

        }