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

        internal SocketError DoOperationDisconnect(Socket socket, SafeCloseSocket handle)
        {
            PrepareIOCPOperation();

            SocketError socketError = SocketError.Success;

            if (!socket.DisconnectEx(
                    handle,
                    _ptrNativeOverlapped,
                    (int)(DisconnectReuseSocket ? TransmitFileOptions.ReuseSocket : 0),
                    0))
            {
                socketError = (SocketError)Marshal.GetLastWin32Error();
            }

            return socketError;
        }

        public bool DisconnectAsync(SocketAsyncEventArgs e)
        {
            bool retval;

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

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

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

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

            // Make the native call.
            SocketError socketError = SocketError.Success;
            try
            {
                socketError = e.DoOperationDisconnect(this, _handle);
            }
            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, 0, SocketFlags.None);
                retval = false;
            }
            else
            {
                retval = true;
            }

            if (s_loggingEnabled)
            {
                 Logging.Exit(Logging.Sockets, this, "DisconnectAsync", retval);
            }

            return retval;
        }