New Post: Unauthorized

__Maybe i made a mistake creating the token???
I read in the documentation that first i need go to an url an accept the app for the user. But untill now, it was working fine without do that.__

The TokenCreator needs to be used for users of your application. It is in fact used to create a Token but if you already have credentials (from the dev.twitter.com), you do not need to accept the app.

Now that you have replied to all my questions I can tell that I am very confused with your issue.

To ensure that you are not posting the same Tweet twice which is not authorized by Twitter. Would you please try to change this line:

 ITweet t = new Tweet("From " + device_Name + ":" + tweet_Tex + "." + follow_link + Guid.NewGuid());

If this is not the problem I believe I will need to debug your application with you on a Skype meeting.
Contact me on my contact form and we can fix a meeting tonight.

Regards,
Linvi