System.Net.Cache.RequestCacheProtocol.GetUpdateStatus C# (CSharp) Method

        internal CacheValidationStatus GetUpdateStatus (WebResponse response, Stream responseStream)
        {
            if (response == null)
                throw new ArgumentNullException("response");

            if (_ProtocolStatus == CacheValidationStatus.DoNotUseCache)
                return CacheValidationStatus.DoNotUseCache;

            try {
                if(Logging.On) Logging.Enter(Logging.RequestCache, this, "GetUpdateStatus", null);

                if (_Validator.Response == null)
                    _Validator.FetchResponse(response);

                if (_ProtocolStatus == CacheValidationStatus.RemoveFromCache)
                {
                    EnsureCacheRemoval(_Validator.CacheKey);
                    return _ProtocolStatus;
                }

                if (_ProtocolStatus != CacheValidationStatus.DoNotTakeFromCache &&
                    _ProtocolStatus != CacheValidationStatus.ReturnCachedResponse &&
                    _ProtocolStatus != CacheValidationStatus.CombineCachedAndServerResponse)
                {
                    if(Logging.On) Logging.PrintInfo(Logging.RequestCache, SR.GetString(SR.net_log_cache_not_updated_based_on_cache_protocol_status, "GetUpdateStatus()", _ProtocolStatus.ToString()));
                    return _ProtocolStatus;
                }

                CheckUpdateOnResponse(responseStream);
            }
            catch (Exception e) {
                _ProtocolException = e;
                _ProtocolStatus = CacheValidationStatus.Fail;
                if (e is ThreadAbortException || e is StackOverflowException || e is OutOfMemoryException) {
                    throw;
                }
                if(Logging.On) Logging.PrintError(Logging.RequestCache, SR.GetString(SR.net_log_cache_object_and_exception, "CacheProtocol#" + this.GetHashCode().ToString(NumberFormatInfo.InvariantInfo), (e is WebException? e.Message: e.ToString())));
            }
            finally {
                if(Logging.On)Logging.Exit(Logging.RequestCache, this, "GetUpdateStatus", "result = " + _ProtocolStatus.ToString());
            }
            return _ProtocolStatus;
        }
        //