System.Net.Sockets.Socket.Receive C# (CSharp) Method

        public int Receive(byte[] buffer, int offset, int size, SocketFlags socketFlags, out SocketError errorCode)
        {
            if (NetEventSource.IsEnabled) NetEventSource.Enter(this);
            if (CleanedUp)
            {
                throw new ObjectDisposedException(this.GetType().FullName);
            }

            // Validate input parameters.
            if (buffer == null)
            {
                throw new ArgumentNullException(nameof(buffer));
            }
            if (offset < 0 || offset > buffer.Length)
            {
                throw new ArgumentOutOfRangeException(nameof(offset));
            }
            if (size < 0 || size > buffer.Length - offset)
            {
                throw new ArgumentOutOfRangeException(nameof(size));
            }

            ValidateBlockingMode();
            if (NetEventSource.IsEnabled) NetEventSource.Info(this, $"SRC:{LocalEndPoint} DST:{RemoteEndPoint} size:{size}");

            int bytesTransferred;
            errorCode = SocketPal.Receive(_handle, buffer, offset, size, socketFlags, out bytesTransferred);

            if (errorCode != SocketError.Success)
            {
                // Update the internal state of this socket according to the error before throwing.
                UpdateStatusAfterSocketError(errorCode);
                if (NetEventSource.IsEnabled)
                {
                    NetEventSource.Error(this, new SocketException((int)errorCode));
                    NetEventSource.Exit(this, 0);
                }
                return 0;
            }

            if (s_perfCountersEnabled)
            {
                bool peek = ((int)socketFlags & (int)SocketFlags.Peek) != 0;

                if (bytesTransferred > 0 && !peek)
                {
                    SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketBytesReceived, bytesTransferred);
                    if (Transport == TransportType.Udp)
                    {
                        SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketDatagramsReceived);
                    }
                }
            }

            if (NetEventSource.IsEnabled)
            {
#if TRACE_VERBOSE
                try
                {
                    if (NetEventSource.IsEnabled) NetEventSource.Info(this, $"SRC:{LocalEndPoint} DST:{RemoteEndPoint} bytesTransferred:{bytesTransferred}");
                }
                catch (ObjectDisposedException) { }
#endif
                NetEventSource.DumpBuffer(this, buffer, offset, bytesTransferred);
                NetEventSource.Exit(this, bytesTransferred);
            }

            return bytesTransferred;
        }

 static void Main(string[] args)
 {
     Socket s=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
     IPEndPoint ie=new IPEndPoint(IPAddress.Parse("127.0.0.1"),9000);
     s.Connect(ie);
     Console.WriteLine("Connected to Server.....");
     byte[] data=new byte[1024];
     int k=s.Receive(data);
     Console.WriteLine("Loi chao tu Server:{0}",Encoding.ASCII.GetString(data,0,k));
     while(true)
     {
         Console.WriteLine("Moi nhap du lieu can tinh");
         string st=Console.ReadLine();
         byte[] dl=new byte[1024];
         dl=Encoding.ASCII.GetBytes(st);
         s.Send(dl,dl.Length,SocketFlags.None);
         if(st.ToUpper().Equals("QUIT"))
             break;
         dl=new byte[1024];
         int k1=s.Receive(dl);
         Console.WriteLine("Ket qua tinh tong tu server tra ve:{0}", Encoding.ASCII.GetString(dl, 0, k1));
     }
     s.Disconnect(true);
     s.Close();
 }