New Post: How to run a code when a given user tweets something?

Hi again,

Problem 1 - A local variable named 'sender' cannot be declared in this scope because it would give a different meaning to 'sender', which is already used in a 'parent or current' scope to denote something else.
sender already existing here us.TweetCreatedByAnyone += (sender, args) => it is in fact the sender of the event not the sender of the tweet. The sender of the tweet can be retrieved like that args.Value.Creator.

Problem 2 - The program would freeze once I run the command above.
The program does not freeze. It basically waits a reply for the stream to close. While the stream is open you are receiving information from Twitter.
You can make the stream run in another thread if you wish a program to run at the same time.

Question 1 - Is my way of writing the tokens and keys wrong? If so Did I mess up the order or what I had to write?
No it seems perfectly alright.

Question 2 - Do I need to run the code once or do I need to keep refreshing it. I would imagine that I would have to run it once since it constantly fetches data from the stream.
Yes as it is a stream you just have to run it once. Also you can pause or stop the stream. In which case you will have to resume/restart it.

Question 3 - Is it normal that my Program Freezes? Can I run the code above and still maintain functionality for the rest of the form? (I am using Windows Forms)
As I said before, you need to run your code in a separate thread. Consequently if you are using Windows Forms, simply put this code in a BackgroundWorker.

PS - Currently I am trying to Bind the code above to a button.
There should not be any relation. If your code is bound to a button. Create a command calling a function that uses a background worker containing your code.

PSS - I used Console Write Line above to keep it simple.
In that case, a new thread would be more appropriate than a Background worker.

Here is an example with a thread (infinite).

List<IUser> myFriendsToUpdate = new List<IUser>
    {
        new User("myFriend1"),
        new User("myFriend2")
    };

IUserStream us = new UserStream();
us.TweetCreatedByAnyone += (sender, args) =>
{
    var senderScreenName = args.Value.Creator.ScreenName;
    if (myFriendsToUpdate.Select(x => x.ScreenName).Contains(senderScreenName))
    {
        Console.WriteLine("Tweet '{0}' created!", args.Value.Text);
    }
};

Thread t = new Thread(() =>
{
    us.StartStream(token);
});

t.Start();