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

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

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

            // If we returned cached response, switch the state to not call cache anymore.
            if (_ProtocolStatus == CacheValidationStatus.ReturnCachedResponse)
            {
                _ProtocolStatus = CacheValidationStatus.DoNotUseCache;
                return _ProtocolStatus;
            }

            try {
                if(Logging.On) Logging.Enter(Logging.RequestCache, this, "GetRevalidateStatus", (_Validator == null? null: _Validator.Request));

                _Validator.FetchResponse(response);

                if (_ProtocolStatus != CacheValidationStatus.Continue && _ProtocolStatus != CacheValidationStatus.RetryResponseFromServer)
                {
                    if(Logging.On) Logging.PrintInfo(Logging.RequestCache, SR.GetString(SR.net_log_cache_revalidation_not_needed, "GetRevalidateStatus()"));
                    return _ProtocolStatus;
                }
                CheckRetrieveOnResponse(responseStream);
            }
            finally {
                if(Logging.On) Logging.Exit(Logging.RequestCache, this, "GetRevalidateStatus", "result = " + _ProtocolStatus.ToString());
            }
            return _ProtocolStatus;
        }
        //