private void button1_Click(object sender, EventArgs e)
        {
            string result = null;
            string url = "http://www.baidu.com/";
            WebResponse response = null;
            StreamReader reader = null;

                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                request.Method = "GET";
                response = request.GetResponse();
                reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
                result = reader.ReadToEnd();

                WebBrowser b = new WebBrowser();
                b.DocumentText = result;
                HtmlDocument doc = b.Document;
                HtmlElementCollection elems = null;

                if (doc != null)
                {
                    elems = doc.GetElementsByTagName("a");
                    textBox1.Text = elems.Count.ToString();//为什么运行结果总是0
              }
        }

自己先顶一下！我的点数很少，各位可能瞧不上，但是恳求各位帮忙解答一下！