Chilkat.Spider spider = new Chilkat.Spider();

            string website = this.textWebsite.Text;

            string url = this.textUrl.Text;

            int links = Int32.Parse(this.textLinks.Text);

            //  The spider object crawls a single web site at a time.  As you'll see

            //  in later examples, you can collect outbound links and use them to

            //  crawl the web.  For now, we'll simply spider 10 pages of chilkatsoft.com

            spider.Initialize(website);


            //  Add the 1st URL:

            spider.AddUnspidered(url);


            //  Begin crawling the site by calling CrawlNext repeatedly.

            int i;

            for (i = 0; i <= links; i++)
            {

                bool success;

                success = spider.CrawlNext();

                if (success == true)
                {
                    Invoke(new AppendTextDelegate(AppendText), new object[] { spider.LastUrl + "\r\n" });
                    GetAllURL(spider.LastUrl.ToString());
                }

                else
                {

                    //  Did we get an error or are there no more URLs to crawl?

                    if (spider.NumUnspidered == 0)
                    {

                        MessageBox.Show("No more URLs to spider");

                    }

                    else
                    {

                        MessageBox.Show(spider.LastErrorText);

                    }

                }


                //  Sleep 1 second before spidering the next URL.

                spider.SleepMs(1000);

            }

HttpWebRequest webRequest1 = (HttpWebRequest)WebRequest.Create(new Uri(URlStr));
            webRequest1.Method = "GET";
            HttpWebResponse response = (HttpWebResponse)webRequest1.GetResponse();
            Stream stream = response.GetResponseStream();
            StreamReader streamReader = new StreamReader(stream, Encoding.Default);
            String textData = streamReader.ReadToEnd();
            streamReader.Close();
            response.Close();

@"(?<EmailStr>\b[A-Z0-9._%-]+@[A-Z0-9._%-]+\.[A-Z]{2,4}\b)"