System.Net.CookieContainer.GetCookieHeader C# (CSharp) Method

        internal string GetCookieHeader(Uri uri, out string optCookie2) {
            CookieCollection cookies = InternalGetCookies(uri);
            string cookieString = String.Empty;
            string delimiter = String.Empty;

            foreach (Cookie cookie in cookies) {
                cookieString += delimiter + cookie.ToString();
                delimiter = "; ";
            }
            optCookie2 = cookies.IsOtherVersionSeen ?
                          (Cookie.SpecialAttributeLiteral +
                           Cookie.VersionAttributeName +
                           Cookie.EqualsLiteral +
                           Cookie.MaxSupportedVersion.ToString(NumberFormatInfo.InvariantInfo)) : String.Empty;

            return cookieString;
        }

        public TrackemonSession FindSessionId()
        {
            var trackemonSession = new TrackemonSession();
            try
            {
                var cookieContainer = new CookieContainer();
                const string homepageUrl = "https://www.trackemon.com";
                var request = WebRequest.CreateHttp(homepageUrl);
                request.Method = "GET";
                request.Timeout = Timeout;
                request.CookieContainer = cookieContainer;
                using (var response = request.GetResponse())
                {
                    var cookieHeader = cookieContainer.GetCookieHeader(new Uri("https://www.trackemon.com"));
                    trackemonSession.cookieHeader = cookieHeader;
                    using (var reader = new StreamReader(response.GetResponseStream()))
                    {
                        string line;

                        while ((line = reader.ReadLine()) != null)
                        {
                            var match = Regex.Match(line, @"var\s+sessionId\s*=\s*\'(1?.*)\'\s*;");
                            if (match.Success)
                            {
                                trackemonSession.sessionId = match.Groups[1].Value;
                                return trackemonSession;
                            }
                        }
                    }
                }
            }
            catch (Exception e)
            {
                Log.Debug("Error trying to get a sessionId for Trackemon: {0}", e.Message);
            }
            return null;
        }