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

        public bool ReceiveMessageFromAsync(SocketAsyncEventArgs e)
        {
            if (NetEventSource.IsEnabled) NetEventSource.Enter(this, e);
            bool retval;

            if (CleanedUp)
            {
                throw new ObjectDisposedException(GetType().FullName);
            }

            if (e == null)
            {
                throw new ArgumentNullException(nameof(e));
            }
            if (e.RemoteEndPoint == null)
            {
                throw new ArgumentNullException("RemoteEndPoint");
            }
            if (!CanTryAddressFamily(e.RemoteEndPoint.AddressFamily))
            {
                throw new ArgumentException(SR.Format(SR.net_InvalidEndPointAddressFamily, e.RemoteEndPoint.AddressFamily, _addressFamily), "RemoteEndPoint");
            }

            SocketPal.CheckDualModeReceiveSupport(this);

            // We don't do a CAS demand here because the contents of remoteEP aren't used by
            // WSARecvMsg; all that matters is that we generate a unique-to-this-call SocketAddress
            // with the right address family.
            EndPoint endPointSnapshot = e.RemoteEndPoint;
            e._socketAddress = SnapshotAndSerialize(ref endPointSnapshot);

            // DualMode may have updated the endPointSnapshot, and it has to have the same AddressFamily as 
            // e.m_SocketAddres for Create to work later.
            e.RemoteEndPoint = endPointSnapshot;

            SetReceivingPacketInformation();

            // Prepare for the native call.
            e.StartOperationCommon(this);
            e.StartOperationReceiveMessageFrom();

            // Make the native call.
            int bytesTransferred;
            SocketError socketError;

            try
            {
                socketError = e.DoOperationReceiveMessageFrom(this, _handle, out bytesTransferred);
            }
            catch
            {
                // Clear in-use flag on event args object. 
                e.Complete();
                throw;
            }

            // Handle completion when completion port is not posted.
            if (socketError != SocketError.Success && socketError != SocketError.IOPending)
            {
                e.FinishOperationSyncFailure(socketError, bytesTransferred, SocketFlags.None);
                retval = false;
            }
            else
            {
                retval = true;
            }

            if (NetEventSource.IsEnabled) NetEventSource.Exit(this, retval);
            return retval;
        }

        public void Start(IPEndPoint localEndPoint, CancellationToken token)
        {
            _token = token;

            _socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            _socket.Bind(localEndPoint);

            EndPoint remote = new IPEndPoint(IPAddress.Any, 0);

            var args = new SocketAsyncEventArgs { RemoteEndPoint = remote };

            args.SetBuffer(new byte[BufferSize], 0, BufferSize);
            args.Completed += CompletedAsync;

            _socket.ReceiveMessageFromAsync(args);
        }