how do I post a tweet using Tweetsharp library

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C#

twitter

Windows-Phone-8

I tried to post a tweet using tweetsharp library for windows phone 8 alot but every time i got an error "An exception of type 'System.Exception' occurred in TweetSharpTestApp.DLL but was not handled in user code"

here is the method for posting to twitter :

public void PostToTwitter()
{
Dispatcher dispatcher = Deployment.Current.Dispatcher;
TwitterService service = new TwitterService ("Consumer Key", "Consumer Key Secret");
service.AuthenticateWith("Access Token", "Access Token Secret");

service.SendTweet(new SendTweetOptions { Status = "Tweeting with #tweetsharp" }, (tweet, response) =>
{
if (response.StatusCode == HttpStatusCode.OK)
{
dispatcher.BeginInvoke(() =>
{
MessageBox.Show("Tweet sent!");
}
);

}
else
{
throw new Exception(response.StatusCode.ToString());
}
});