微信开发之（二）获取access_token

         /// <summary>
        /// 获取访问凭证
        /// </summary>
        /// <returns></returns>
        private string GetAccessToken()
        {
            string url_token = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=wx114078ffd192d5&secret=c76fc416e4d9e33e9c9ddb2d4bc9e3";
            HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(url_token);
            myRequest.Method = "GET";
            HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
            StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);
            string content = reader.ReadToEnd(); 
            reader.Close();
            return content;
        }