System.Net.FileWebRequest.CreateResponse C# (CSharp) Method

        private WebResponse CreateResponse()
        {
            if (_writePending || _writing)
            {
                lock (this)
                {
                    if (_writePending || _writing)
                    {
                        _blockReaderUntilRequestStreamDisposed = new ManualResetEventSlim();
                    }
                }
            }
            _blockReaderUntilRequestStreamDisposed?.Wait();

            try
            {
                return _response ?? (_response = new FileWebResponse(this, _uri, _fileAccess, !_syncHint));
            }
            catch (Exception e)
            {
                throw new WebException(e.Message, e);
            }
        }