New Post: Beginner - Help

You need:

using System.Linq;

You'll need a reference to "System.Core".

I just thought that you should make sure that the call to search is actually not working. Because you only mention about the tweet not getting posted to the profile.

Your console.WriteLine is working as expected. Maybe you can break at the console.WriteLine call and check the value of tweets in the debugger.

Or just do:
MessageBox.Show(tweets.ToArray()[0].Text);