updates not showing in twitter

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C#

I WANT AUTOMATE tweets to twitteer via asp.net web application .i found this code , i tried it.but no trace of any updtaes.my code is

protected void Page_Load(object sender, EventArgs e)
       {
           OAuthTokens tokens = new OAuthTokens();
           tokens.AccessToken = "467102587-8651xqerwjWLdUgt7QxaGOdZMW8V740Ef6q13dRY";
           tokens.AccessTokenSecret = "w71jBfoot4PwuMKkz8H3PHw87oteATvuIUxTkjC2M8";
           tokens.ConsumerKey = "2TNZjhWS6cwSJPyfongjg";
           tokens.ConsumerSecret = "8VpuJqQ8MZ4xTF2EGiBI4lpOVQ6lH0aIXb6ck3WAeQ";

           TwitterResponse<twitterstatus> tweetResponse = TwitterStatus.Update(tokens, "Hello, #Twitterizer");
           if (tweetResponse.Result == RequestResult.Success)
           {
               Label1.Text = "posted tweet";
           }
           else
           {
               Label1.Text = "not posted";
           }
       }
   }

always i am getting label 2 only.can any one help me how to post updates. my settings are like this.
this api has read and write permissions,get permission