I suggest that you download the source code of TweetInvi and go through the ExampleInvi project. It'll help you a lot in getting started.
The maximum number of tweets that you can get this way is limited by the twitter api. Read up dev.twitter.com for more info.
imlokesh
var user = User.GetUserFromScreenName("yourfriend"); var tweets = user.GetUserTimeline(1000); // Get 1000 tweetsforeach (var tweet in tweets) { Console.WriteLine(tweet.Text); }
imlokesh