Saving Tweetinvi credentials without re-authenticating every time
<p>Basically what I'm trying to do is to get recent tweets from a user and do stuff with them. I'm using Tweetinvi with PIN-based authentication, as described on the website, like this: </p>

<pre><code>// Create a new set of credentials for the application
var appCredentials = new TwitterCredentials("CONSUMER_KEY", "CONSUMER_SECRET");

// Go to the URL so that Twitter authenticates the user and gives him a PIN code
var url = CredentialsCreator.GetAuthorizationURL(appCredentials);

// This line is an example, on how to make the user go on the URL
Process.Start(url);

// Ask the user to enter the pin code given by Twitter
var pinCode = Console.ReadLine();

// With this pin code it is now possible to get the credentials back from Twitter
var userCredentials = CredentialsCreator.GetCredentialsFromVerifierCode(pinCode, appCredentials);

// Use the user credentials in your application
Auth.SetCredentials(userCredentials);
</code></pre>

<p>Now the problem is that I have to sign in and connect to Twitter every time I launch my application via browser, which is mildly annoying. I've tried to save my authentication details in a text file (Consumer Key, Consumer Secret, Access Token, Access Token Secret), and then just insert the info into appCredentials and userCredentials, but with no results, as I keep getting TwitterNullCredentialsException. So how do I save my credentials so that I don't have to reconnect on every launch?</p>