Better way to load a web home page and enter search term

// ~~> Create a browser, a flag and a "home" page.                
// Create browser.
WebBrowser browser = new WebBrowser();

// Create flag for home page loaded.
bool homepageLoaded = false;

// Dummy page (would come from a textbox etc in reality).
string homePage = "http://CompanyName.com/web/";

// ~~> Add handler and navigate to page.
// Add handler.
browser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(browser_DocumentCompleted);
// Navigate to web site home page.
browser.Navigate(homePage);

//private void browser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {                        
            // Wait until the webpage has loaded completely
            if (e.Url.AbsoluteUri == homePage)
            {                                
                // Set flag.
                homepageLoaded = true;
                
                // Create document.
                HtmlDocument document = browser.Document;

                // Enter search term value.
                HtmlElement tb = document.GetElementById("searchTerm");
                tb.SetAttribute("value", "12345678");
                // Click the button.
                HtmlElement btn = document.GetElementById("btnSearch");
                btn.InvokeMember("Click");
            }
            else
            {
                string url = null;
                
                // Capture new webpage details.
                if (homepageLoaded && e.Url.AbsoluteUri.Contains(homePage))
                {
                    // Search result webpage.
                    url = e.Url.AbsoluteUri.ToString();

                    // -------------------------------------------------------
                    // Use this "url" for scraping...(I am okay from here)
                    // -------------------------------------------------------
                }
            }
        }