Efficient Way to Crawl through Web Sites or Better Way to Download WebSite Content

private static string GetWebTest1(string url)
        {
            System.Net.WebClient Client = new WebClient();
            return Client.DownloadString(url);
        }

private static string GetWebTest2(string url)
       {
           HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
           WebResponse response = request.GetResponse();
           Stream stream = response.GetResponseStream();
           StreamReader reader = new StreamReader(stream);
           return reader.ReadToEnd();
       }