Map financial entity by it's relations using Google finance

gistfile1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
// Requires reference to WebDriver.dll and WebDriver.Support.dll
// Furthermore, Firefox uses "selenium-ide-1.9.0.xpi" plugin.
using OpenQA.Selenium;
using OpenQA.Selenium.Firefox;
using OpenQA.Selenium.Support.UI;

namespace SeleniumGoogleFinances
{
    class Program
    {
        public class RelatedFinances
        {
            Dictionary<string, List<string>> results;
            Dictionary<string, string> knownURLs = new Dictionary<string, string>();
            public RelatedFinances(string root)
            {
                this.results = new Dictionary<string, List<string>>();
                this.branchRelated(root);
            }

            public override string ToString()
            {
                StringBuilder sb = new StringBuilder();
                foreach (var key in results.Keys)
                    foreach (var item in results[key])
                        sb.Append(key).Append(',').Append(item).Append('\n');

                return sb.ToString();
            }
            public void branchExpand()
            {
                HashSet<string> leafes = new HashSet<string>();
                foreach (var items in results.Values)
                    foreach (var item in items)
                        leafes.Add(item);
                foreach (var item in leafes)
                    this.branchRelated(item);
            }
            public bool branchRelated(string symbol)
            {
                if (results.ContainsKey(symbol))
                    return false;

                List<string> result = new List<string>();
                IWebDriver browser = new FirefoxDriver();
                WebDriverWait w = new WebDriverWait(browser, new TimeSpan(0, 0, 5));

                try
                {
                    string url = (this.knownURLs.ContainsKey(symbol) ?
                        this.knownURLs[symbol] : "http://www.google.com/finance?q=" + symbol);
                    browser.Navigate().GoToUrl(url);
                    w.Until(d => d.FindElement(By.LinkText("Related companies")));
                    browser.FindElement(By.LinkText("Related companies")).Click();
                    w.Until(d => d.FindElement(By.ClassName("ctname")));
                    foreach (var item in browser.FindElements(By.ClassName("ctname"))){
                        result.Add(item.Text);

                        try {
                            var sibling = item.FindElement(By.XPath("//a[@title='" + item.Text + "']"));
                            knownURLs.Add(item.Text, sibling.GetAttribute("href"));
                        } catch (Exception) {/* ignore */}
                    }
                }
                catch(TimeoutException te){
                    Console.Error.WriteLine("Error: " + symbol);
                }
                finally
                {
                    browser.Quit();
                }

                return this.add(result);
            }

            private bool add(List<string> result)
            {
                if (result.Count() == 0)
                    return false;

                String key = result[0];
                if (results.ContainsKey(key))
                    return false;

                result.RemoveAt(0);
                this.results.Add(key, result);
                return true;
            }
        }
        static void Main(string[] args)
        {
            string root = (args.Length > 0 ? args[0] : "Apple");
            RelatedFinances rf = new RelatedFinances(root);
            rf.branchExpand();
            rf.branchExpand();
            Console.WriteLine(rf);
        }
    }
}