ارسال پیام در توییتر توسطC# ASP.NET

public static void PostMessageToTwitter(string message)
    {
        //The facebook json url to update the status
        string twitterURL = "https://api.twitter.com/1.1/statuses/update.json";

        //set the access tokens (REQUIRED)
        string oauth_consumer_key = "****";
        string oauth_consumer_secret = "****";
        string oauth_token = "****";
        string oauth_token_secret = "****";

        // set the oauth version and signature method
        string oauth_version = "1.0";
        string oauth_signature_method = "HMAC-SHA1";

        // create unique request details
        string oauth_nonce = Convert.ToBase64String(new ASCIIEncoding().GetBytes(DateTime.Now.Ticks.ToString()));
        System.TimeSpan timeSpan = (DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc));
        string oauth_timestamp = Convert.ToInt64(timeSpan.TotalSeconds).ToString();

        // create oauth signature
        string baseFormat = "oauth_consumer_key={0}&oauth_nonce={1}&oauth_signature_method={2}" +
                            "&oauth_timestamp={3}&oauth_token={4}&oauth_version={5}&status={6}";

        string baseString = string.Format(
            baseFormat,
            oauth_consumer_key,
            oauth_nonce,
            oauth_signature_method,
            oauth_timestamp, oauth_token,
            oauth_version,
            Uri.EscapeDataString(message)
            );

        string oauth_signature = null;
        using (
            HMACSHA1 hasher =
                new HMACSHA1(
                    ASCIIEncoding.ASCII.GetBytes(Uri.EscapeDataString(oauth_consumer_secret) + "&" +
                                                 Uri.EscapeDataString(oauth_token_secret))))
        {
            oauth_signature =
                Convert.ToBase64String(
                    hasher.ComputeHash(
                        ASCIIEncoding.ASCII.GetBytes("POST&" + Uri.EscapeDataString(twitterURL) + "&" +
                                                     Uri.EscapeDataString(baseString))));
        }

        // create the request header
        string authorizationFormat = "OAuth oauth_consumer_key=\"{0}\", oauth_nonce=\"{1}\", " +
                                     "oauth_signature=\"{2}\", oauth_signature_method=\"{3}\", " +
                                     "oauth_timestamp=\"{4}\", oauth_token=\"{5}\", " + "oauth_version=\"{6}\"";

        string authorizationHeader = string.Format(
            authorizationFormat,
            Uri.EscapeDataString(oauth_consumer_key),
            Uri.EscapeDataString(oauth_nonce),
            Uri.EscapeDataString(oauth_signature),
            Uri.EscapeDataString(oauth_signature_method),
            Uri.EscapeDataString(oauth_timestamp),
            Uri.EscapeDataString(oauth_token),
            Uri.EscapeDataString(oauth_version)
            );

        HttpWebRequest objHttpWebRequest = (HttpWebRequest) WebRequest.Create(twitterURL);
        objHttpWebRequest.Headers.Add("Authorization", authorizationHeader);
        objHttpWebRequest.Method = "POST";
        objHttpWebRequest.ContentType = "application/x-www-form-urlencoded";
        using (Stream objStream = objHttpWebRequest.GetRequestStream())
        {
            byte[] content = ASCIIEncoding.ASCII.GetBytes("status=" + Uri.EscapeDataString(message));
            objStream.Write(content, 0, content.Length);
        }

        var responseResult = "";
        try
        {
            //success posting
            WebResponse objWebResponse = objHttpWebRequest.GetResponse();
            StreamReader objStreamReader = new StreamReader(objWebResponse.GetResponseStream());
            responseResult = objStreamReader.ReadToEnd().ToString();
        }
        catch (Exception ex)
        {
            //throw exception error
            responseResult = "Twitter Post Error: " + ex.Message.ToString() + ", authHeader: " + authorizationHeader;
        }
    }