public ActionResult Verify()

in src/VstsDemoBuilder/Controllers/AccountController.cs [44:135]
88 lines of code
20 McCabe index (conditional complexity)

        public ActionResult Verify(LoginModel model, string id)
        {
            Session.Clear();
            // check to enable extractor
            if (string.IsNullOrEmpty(model.EnableExtractor) || model.EnableExtractor.ToLower() == "false")
            {
                model.EnableExtractor = System.Configuration.ConfigurationManager.AppSettings["EnableExtractor"];
            }
            if (!string.IsNullOrEmpty(model.EnableExtractor))
            {
                Session["EnableExtractor"] = model.EnableExtractor;
            }

            var browser = Request.Browser.Type;
            if (browser.Contains("InternetExplorer"))
            {
                return RedirectToAction("Unsupported_browser", "Account");
            }
            try
            {
                if (!string.IsNullOrEmpty(model.name))
                {
                    if (System.IO.File.Exists(Server.MapPath("~") + @"\Templates\TemplateSetting.json"))
                    {
                        string privateTemplatesJson = System.IO.File.ReadAllText(Server.MapPath("~") + @"\Templates\TemplateSetting.json");
                        templates = Newtonsoft.Json.JsonConvert.DeserializeObject<TemplateSelection.Templates>(privateTemplatesJson);
                        if (templates != null)
                        {
                            bool flag = false;
                            foreach (var grpTemplate in templates.GroupwiseTemplates)
                            {
                                foreach (var template in grpTemplate.Template)
                                {
                                    if (template.ShortName != null && template.ShortName.ToLower() == model.name.ToLower())
                                    {
                                        flag = true;
                                        Session["templateName"] = template.Name;
                                    }
                                }
                            }
                            if (flag == false)
                            {
                                Session["templateName"] = null;
                            }
                        }
                    }
                }

                if (!string.IsNullOrEmpty(model.Event))
                {
                    string eventsTemplate = Server.MapPath("~") + @"\Templates\Events.json";
                    if (System.IO.File.Exists(eventsTemplate))
                    {
                        string eventContent = System.IO.File.ReadAllText(eventsTemplate);
                        var jItems = JObject.Parse(eventContent);
                        if (jItems[model.Event] != null)
                        {
                            model.Event = jItems[model.Event].ToString();
                        }
                        else
                        {
                            model.Event = string.Empty;
                        }
                    }
                }

                if (!string.IsNullOrEmpty(model.TemplateURL))
                {
                    if (model.TemplateURL.EndsWith(".zip"))
                    {
                        PrivateTemplate _privateTemplate = UploadPrivateTempalteFromHome(model.TemplateURL);
                        if (_privateTemplate.IsTemplateValid)
                        {
                            Session["PrivateTemplateURL"] = _privateTemplate.privateTemplatePath;
                            Session["PrivateTemplateName"] = _privateTemplate.privateTemplateName;
                            Session["PrivateTemplateOriginalName"] = _privateTemplate.privateTemplateOriginalName;
                        }
                        else
                        {
                            ViewBag.resMessage = _privateTemplate.responseMessage;
                            return View(new LoginModel());
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                logger.Debug(JsonConvert.SerializeObject(ex, Formatting.Indented) + Environment.NewLine);
            }
            //return RedirectToAction("../account/verify");
            return View(model);
        }