The Code Works Fine When Debugging, But it Doesn't work when it runs without Debugging

string entry = Titleentry.Text;
            webBrowser1.Navigate("http://www.bookdepository.com/search/advanced");

            //HtmlElementCollection bookCollection;

            while (webBrowser1.ReadyState != WebBrowserReadyState.Complete)
            {
                Application.DoEvents();
            }

            HtmlElementCollection bookCollection = webBrowser1.Document.GetElementsByTagName("input");
            foreach (HtmlElement curElement in bookCollection)
            {
                if ((curElement.GetAttribute("id").ToString() == "searchTitle"))
                {
                    curElement.SetAttribute("value", entry);
                }
            }



            HtmlElementCollection filterCollection = webBrowser1.Document.GetElementById("filterSortBy").GetElementsByTagName("option");
            List<HtmlElement> filterList = new List<HtmlElement>();
            foreach (HtmlElement filterItem in filterCollection) { filterList.Add(filterItem); }
            HtmlElement filterElement =
              (HtmlElement)filterList.Where(filterOption => filterOption.GetAttribute("value").Equals("price_low_high", StringComparison.InvariantCultureIgnoreCase)).SingleOrDefault();

            if (filterElement.GetAttribute("value").Equals("price_low_high"))
            {
                filterElement.SetAttribute("Selected", "price_low_high");
                filterElement.InvokeMember("click");
            }

            bookCollection = webBrowser1.Document.GetElementsByTagName("button");

            foreach (HtmlElement curElement in bookCollection)
            {
                if (curElement.GetAttribute("id").Equals("searchSubmit"))
                {
                    curElement.InvokeMember("click");
                }
            }
            while (webBrowser1.ReadyState != WebBrowserReadyState.Complete)
            {
                Application.DoEvents();
            }

            MessageBox.Show("Loaded");

            System.Timers.Timer myTimer = new System.Timers.Timer(5000);
            myTimer.Enabled = true;
            myTimer.Start();
            myTimer.Stop();

            if (webBrowser1.ReadyState == WebBrowserReadyState.Complete) //from here on the code doesnt work.
            {
                HtmlElementCollection avCollection = webBrowser1.Document.GetElementById("filterAvailability").GetElementsByTagName("option");

                List<HtmlElement> avList = new List<HtmlElement>();
                foreach(HtmlElement avItem in avCollection)
                {
                    avList.Add(avItem);
                }

                HtmlElement avElement =
                    (HtmlElement)avList.Where(avOption => avOption.GetAttribute("value").Equals("1")).SingleOrDefault();

                if (avElement.GetAttribute("value").Equals("1"))
                {
                    avElement.SetAttribute("Selected", "1");
                    avElement.InvokeMember("click");
                }

                bookCollection = webBrowser1.Document.GetElementsByTagName("button");
                foreach (HtmlElement curElement in bookCollection)
                {
                    if (curElement.GetAttribute("id").Equals("searchSubmit"))
                    {
                        curElement.InvokeMember("click");
                    }
                }
            }