My client would like me to use .NET to post to Twitter, and suggests that I use C#.
Q: How do I post \"Hello World\" to twitter using C#?
This post mentions
Just use this implemented wrapper for the Twitter API:
https://github.com/danielcrenna/tweetsharp
var twitter = FluentTwitter.CreateRequest()
.AuthenticateAs("USERNAME", "PASSWORD")
.Statuses().Update("Hello World!")
.AsJson();
var response = twitter.Request();
From: http://code-inside.de/blog-in/2009/04/23/howto-tweet-with-c/
There is even a DotNetRocks interview with the developers.