//1) 准备用户验证数据： 　username是你的微博登录用户名，password是你的博客密码。
            string username = "********";
            string password = ""********";
            string usernamePassword = username + ":" + password;


            //2) 准备调用的URL及需要POST的数据：
            string url = "https://api.weibo.com/2/statuses/update.json";

            string news_title = "祝大家！龙年吉祥，天天开心！";
            string t_news = string.Format("{0}，http://www.baidu.com", news_title);
            string data = "source=[color=#FF0000]2360366171[/color]&status=" + System.Web.HttpUtility.UrlEncode(t_news);

            //3)准备用于发起请求的HttpWebRequest对象：
            System.Net.WebRequest webRequest = System.Net.WebRequest.Create(url);
            System.Net.HttpWebRequest httpRequest = webRequest as System.Net.HttpWebRequest;

            //4)准备用于用户验证的凭据： 
            System.Net.CredentialCache myCache = new System.Net.CredentialCache();
            myCache.Add(new Uri(url), "Basic", new System.Net.NetworkCredential(username, password));
            httpRequest.Credentials = myCache;
            httpRequest.Headers.Add("Authorization", "Basic " +
            Convert.ToBase64String(new System.Text.ASCIIEncoding().GetBytes(usernamePassword)));


            //5)发起POST请求： 
            httpRequest.Method = "POST";
            httpRequest.ContentType = "application/x-www-form-urlencoded";
            System.Text.Encoding encoding = System.Text.Encoding.ASCII;
            byte[] bytesToPost = encoding.GetBytes(data);
            httpRequest.ContentLength = bytesToPost.Length;
            System.IO.Stream requestStream = httpRequest.GetRequestStream();
            requestStream.Write(bytesToPost, 0, bytesToPost.Length);
            requestStream.Close();


            //6)获取服务端的响应内容：
            System.Net.WebResponse wr = httpRequest.GetResponse();
            System.IO.Stream receiveStream = wr.GetResponseStream();
            using (System.IO.StreamReader reader = new System.IO.StreamReader(receiveStream, System.Text.Encoding.UTF8))
            {
                string responseContent = reader.ReadToEnd();

            }