winFrom http协议

 public static string GetStringByUrl(string url)
        {
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            request.Method = "GET";
            request.ContentType = "application/x-www-form-urlencoded";

            HttpWebResponse webResponse = request.GetResponse() as HttpWebResponse;
            using (Stream s = webResponse.GetResponseStream())
            {
                StreamReader reader = new StreamReader(s, Encoding.UTF8);
                return reader.ReadToEnd();
            }
        }

   var result = GetStringByUrl(textBox1.Text.Trim());