tweet to twitter....

I getting an error 401 unautorized in Twitter Post. Plz Help me.


public void PostTweet()
{

string baseUrl = "https://api.twitter.com/1/statuses/update.json";
const string signatureMethod = "HMAC-SHA1";
const string oauthVersion = "1.0";
var timeSpan = (DateTime.UtcNow - new DateTime(1970, 1, 1));
string timestamp = ((int)timeSpan.TotalSeconds).ToString();
var nonce = GenerateNonce(timestamp);
var signature = sign;//CreateSignature(requestMethod, baseUrl, consumerKey, consumerSecret, nonce, signatureMethod, timestamp, accessToken, oauthVersion, string.Empty, string.Empty, requestType, status);
var bodyData = "status=" + UrlEncode("Post to ");
var webRequest = (HttpWebRequest)WebRequest.Create(baseUrl);
webRequest.KeepAlive = true;
webRequest.ServicePoint.Expect100Continue = false;
webRequest.Method = HttpMethod.Post;

//Send in as POST

webRequest.Accept = "*/*";
webRequest.UserAgent = "Renicorp.Social";
//webRequest.Headers["Authorization"] = testheader;
webRequest.Headers["Authorization"] = "OAuth " + UrlEncode("oauth_consumer_key") + "=\"" + UrlEncode("P54j3gUio46UJeSsk6DUw") + "\", " +
UrlEncode("oauth_nonce") + "=\"" + UrlEncode(nonce) + "\", " +
UrlEncode("oauth_signature") + "=\"" + UrlEncode(signature) + "\", " +
UrlEncode("oauth_signature_method") + "=\"" + UrlEncode(signatureMethod) + "\", " +
UrlEncode("oauth_timestamp") + "=\"" + UrlEncode(timestamp.ToString()) + "\", " +
UrlEncode("oauth_token") + "=\"" + UrlEncode(testaccesstoken) + "\", " +
UrlEncode("oauth_version") + "=\"" + UrlEncode(oauthVersion) + "\"";
string postData = bodyData;
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
webRequest.ContentType = "application/x-www-form-urlencoded";
webRequest.ContentLength = byteArray.Length;
using (Stream dataStream = webRequest.GetRequestStream())
{
dataStream.Write(byteArray, 0, byteArray.Length);
} //Make the web call and return the response
WebResponse response = webRequest.GetResponse();
var responseBody = string.Empty;
Stream stream = response.GetResponseStream();
if (stream != null)
responseBody = new StreamReader(stream).ReadToEnd();
//return responseBody;
//string url = "http://twitter.com/statuses/update.xml?access_token="+token;
//WebbRequest(Method.POST, url, "message=" + HttpUtility.UrlEncode(msg));

}