AzureTicker.Worker.BL.BillProvider.GetAccessToken C# (CSharp) Method

        private static string GetAccessToken(string userName, string password)
        {
            string retVal = null;

            CookieContainer cookies = new CookieContainer();

            string HTML = null;
            string postUrl = null;
            string nextRequestBody = null;

            // Build and make the initial get request
            HttpWebRequest httpRequest = BuildInitialSiteRequest();
            using (HttpWebResponse response = (HttpWebResponse)httpRequest.GetResponse())
            {
                ExtractResponseCookiesToCookieContainer(ref cookies, response, 11, "http://login.live.com");
                HTML = GetHTMLFromResponse(response);
                nextRequestBody = BuildTokenPostFromInitialSiteRequest(HTML, userName, password, out postUrl);
            }

            //POST to the specified URI with the appropraite cookies
            HttpWebRequest httpRequest2 = BuildPostRequest(ref cookies, postUrl, nextRequestBody);
            // Get the response
            using (HttpWebResponse response2 = (HttpWebResponse)httpRequest2.GetResponse())
            {
                // Get the html
                HTML = GetHTMLFromResponse(response2);
                ExtractResponseCookiesToCookieContainer(ref cookies, response2, 8, "http://login.live.com");
                nextRequestBody = BuildPostBodyFromSecondRequest(HTML);
            }

            //POST back to the initial uri with the post body from the 2nd request
            HttpWebRequest httpRequest3 = BuildThirdRequest(cookies, httpRequest, nextRequestBody);
            using (HttpWebResponse response3 = (HttpWebResponse)httpRequest3.GetResponse())
            {
                HTML = GetHTMLFromResponse(response3, true);
                ExtractResponseCookiesToCookieContainer(ref cookies, response3, 12, "http://login.live.com");
            }
            return retVal;
        }