System.Net.BasicClient.Authenticate C# (CSharp) Method

        public Authorization Authenticate(string challenge, WebRequest webRequest, ICredentials credentials) {
            GlobalLog.Print("BasicClient::Authenticate(): " + challenge);

            GlobalLog.Assert(credentials != null, "BasicClient::Authenticate()|credentials == null");
            if (credentials==null) {
                return null;
            }

            HttpWebRequest httpWebRequest = webRequest as HttpWebRequest;

            GlobalLog.Assert(httpWebRequest != null, "BasicClient::Authenticate()|httpWebRequest == null");
            if (httpWebRequest==null || httpWebRequest.ChallengedUri==null) {
                //
                // there has been no challenge:
                // 1) the request never went on the wire
                // 2) somebody other than us is calling into AuthenticationManager
                //
                return null;
            }

            int index = AuthenticationManager.FindSubstringNotInQuotes(challenge, Signature);
            if (index < 0) {
                return null;
            }

            return Lookup(httpWebRequest, credentials);
        }