I created a new application and registered it with Twitter to get the consumer key, consumer key secret, token, and token secret. I then added a reference to TweetSharp. Next I used the code from https://github.com/danielcrenna/tweetsharp where it says "Authenticating a client application (i.e. desktop)".
The page it always opened had no key in the title bar. I noticed that the oAuthRequestToken in step 1 had two properties for token/token secret, and neither were set. So I manually added lines to set these two. I tried again. This time the Url that opened in the browser looked to be complete.
All I ever see is "Whoa there! The request token for this page is invalid. It may have already been used, or expired because it is too old. Please go back to the site or application that sent you here and try again; it was probably just a mistake."
I've tried recreating the tokens, and sending keys as well as tokens in case I wasn't understanding it. I am completely lost. It can't be this difficult just to get started!
Any ideas?