Create and Publish tweet.

createtweet.cs

//Add reference of Tweetinvi
using Tweetinvi;
using Tweetinvi.Models;

public static void CreateTweet(string text)
{
    var credentials = new TwitterCredentials(TwitterConsumerKey,
        TwitterConsumerSecret, 
        TwitterAccessToken, 
        TwitterAccessTokenSecret);
    var client = new TwitterClient(credentials);
    var tweet = client.Tweets.PublishTweetAsync(text).Result;
}