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        public string Search(string searchString)
        {
            int start = 0;
            WebClient wc = new WebClient();
            string html = string.Empty;
            do
            {
                html += wc.DownloadString(string.Format("http://www.google.de/search?q={0}&start={1}", searchString, start));
                start += 10;
                // Thread.Sleep(5000);
            } while (html.Contains("<b>Weiter</b>"));
            return html;
        }					

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Der Remoteserver hat einen Fehler zurückgegeben: (503) Server nicht verfügbar.					

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                // Request
                var request = (HttpWebRequest)WebRequest.Create(uri);
                request.CookieContainer = _cookieContainer;
                request.UserAgent = UserAgent; // Firefox 12
                request.AutomaticDecompression = _automaticDecompression; // GZIP | DEFLATE
                request.KeepAlive = true;
                request.MaximumAutomaticRedirections = MaximumAutomaticRedirections; // 5
                request.AllowAutoRedirect = allowAutoRedirect; // true
                request.Headers.Set(HttpRequestHeader.AcceptLanguage, AcceptLanguage); // de-de,de;q=0.8,en-us;q=0.5,en;q=0.3
                var response = (HttpWebResponse)request.GetResponse();
                Stream stream =  response.GetResponseStream();					

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http://www.google.de/search?q=searchString					

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http://www.google.de/sorry/?continue=http://www.google.de/search?q=searchString					

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Thread.Sleep(new Random().Next(10, 3000));