Update twitter status with c#

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C#

C#4.0

var oauth_token ="";
var oauth_token_secret = "";

var oauth_consumer_key = "";
var oauth_consumer_secret = "";

//requestToken = OAuthUtility.GetRequestToken(oauth_consumer_key, oauth_consumer_secret, "http://127.0.0.1/");
//var oauth_token =requestToken.Token;
//var oauth_token_secret = requestToken.TokenSecret;

// oauth implementation details
var oauth_version = "1.0";
var oauth_signature_method = "HMAC-SHA1";

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

// message api details
var status = "Updating status via REST API if this works";
var resource_url = "https://api.twitter.com/1.1/statuses/user_timeline.json";
var screen_name ="username";
var count = "1";
// create oauth signature
var baseFormat = "count={7}&oauth_consumer_key={0}&oauth_nonce={1}&oauth_signature_method={2}" + "&oauth_timestamp={3}&oauth_token={4}&oauth_version={5}&screen_name={6}";
var baseString = string.Format(baseFormat, oauth_consumer_key, oauth_nonce, oauth_signature_method, oauth_timestamp, oauth_token, oauth_version, Uri.EscapeDataString(screen_name), Uri.EscapeDataString(count));

baseString = string.Concat("GET&", Uri.EscapeDataString(resource_url), "&", Uri.EscapeDataString(baseString));

var compositeKey = string.Concat(Uri.EscapeDataString(oauth_consumer_secret),
"&", Uri.EscapeDataString(oauth_token_secret));

string oauth_signature;
using (HMACSHA1 hasher = new HMACSHA1(ASCIIEncoding.ASCII.GetBytes(compositeKey)))
{
oauth_signature = Convert.ToBase64String(
hasher.ComputeHash(ASCIIEncoding.ASCII.GetBytes(baseString)));
}

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

var authHeader = string.Format(headerFormat,
Uri.EscapeDataString(oauth_nonce),
Uri.EscapeDataString(oauth_signature_method),
Uri.EscapeDataString(oauth_timestamp),
Uri.EscapeDataString(oauth_consumer_key),
Uri.EscapeDataString(oauth_token),
Uri.EscapeDataString(oauth_signature),
Uri.EscapeDataString(oauth_version)
);


// make the request

ServicePointManager.Expect100Continue = false;

var postBody = "screen_name=" + Uri.EscapeDataString(screen_name);//
var postbody2 = "count=" + Uri.EscapeDataString(count);
resource_url += "?" + postBody + "&" + postbody2;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(resource_url);
request.Headers.Add("Authorization", authHeader);
request.Method = "GET";
request.ContentType = "application/x-www-form-urlencoded";


WebResponse response = request.GetResponse();
string responseData = new StreamReader(response.GetResponseStream()).ReadToEnd();

var resource_url1 = "https://api.twitter.com/1.1/statuses/update.json";
resource_url1 += "?status=" + textbox.Text;

HttpWebRequest request1 = (HttpWebRequest)WebRequest.Create(resource_url1);
request1.Headers.Add("Authorization", authHeader);
request1.Method = "POST";
request1.ContentType = "application/x-www-form-urlencoded";

WebResponse response1 = request1.GetResponse();
string responseData1 = new StreamReader(response1.GetResponseStream()).ReadToEnd();


This code gives (401)Unautorized exception in

WebResponse response1 = request1.GetResponse();