private string HttpGet(string url)
        {
            WebRequest wRequest = WebRequest.Create(url);
            wRequest.Method = "GET";
            wRequest.ContentType = "text/html;charset=utf-8";
            WebResponse wResponse = wRequest.GetResponse();
            Stream stream = wResponse.GetResponseStream();
            StreamReader reader = new StreamReader(stream, Encoding.UTF8);
            string str = reader.ReadToEnd();
            return str;
        }
 

public string PostPage(string posturl, string postData)
        {
            Stream outstream = null;
            Stream instream = null;
            StreamReader sr = null;
            HttpWebResponse response = null;
            HttpWebRequest request = null;
            Encoding encoding = Encoding.UTF8;
            byte[] data = encoding.GetBytes(postData);
            // 準備請求...
            try
            {
                // 設定引數
                request = WebRequest.Create(posturl) as HttpWebRequest;
                CookieContainer cookieContainer = new CookieContainer();
                request.CookieContainer = cookieContainer;
                request.AllowAutoRedirect = true;
                request.Method = "POST";
                request.ContentType = "application/x-www-form-urlencoded";
                request.ContentLength = data.Length;
                outstream = request.GetRequestStream();
                outstream.Write(data, 0, data.Length);
                outstream.Close();
                //傳送請求並獲取相應迴應資料
                response = request.GetResponse() as HttpWebResponse;
                //直到request.GetResponse()程式才開始向目標網頁傳送Post請求
                instream = response.GetResponseStream();
                sr = new StreamReader(instream, encoding);
                //返回結果網頁（html）程式碼
                string content = sr.ReadToEnd();
                string err = string.Empty;
                return content;
            }
            catch (Exception ex)
            {
                string err = ex.Message;
                return string.Empty;
            }
        }