New Post: Tweet some text on twitter using C#

I have an web application, in which i have to post text on user's twitter account with use of their username and password.
After performing R&D i able to find out the below code using

var twitter = FluentTwitter.CreateRequest()

        .AuthenticateAs("USERNAME", "PASSWORD")
    .Statuses().Update("testing, one, two, three!")
       .AsJson();

        var response = twitter.Request();

and also find document for XAuth (TEXT). But XAuth supports only window based and mobile application.

How should i do it with tweetinvi or any other source.
Please help.