System.Net.Sockets.SocketAsyncEventArgs.DoOperationReceiveMessageFrom C# (CSharp) Method

        internal unsafe SocketError DoOperationReceiveMessageFrom(Socket socket, SafeCloseSocket handle, out int bytesTransferred)
        {
            PrepareIOCPOperation();

            SocketError socketError = socket.WSARecvMsg(
                handle,
                _ptrWSAMessageBuffer,
                out bytesTransferred,
                _ptrNativeOverlapped,
                IntPtr.Zero);

            if (socketError == SocketError.SocketError)
            {
                socketError = SocketPal.GetLastSocketError();
            }

            return socketError;
        }

        public bool ReceiveMessageFromAsync(SocketAsyncEventArgs e)
        {
            bool retval;

            if (s_loggingEnabled)
            {
                Logging.Enter(Logging.Sockets, this, "ReceiveMessageFromAsync", "");
            }

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

            if (e == null)
            {
                throw new ArgumentNullException("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");
            }

            // 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 (Exception ex)
            {
                // Clear in-use flag on event args object. 
                e.Complete();
                throw ex;
            }

            // 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 (s_loggingEnabled)
            {
                Logging.Exit(Logging.Sockets, this, "ReceiveMessageFromAsync", retval);
            }

            return retval;
        }