Simple Rx Instance Search

Form1.cs

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        SearchList("");//load all
        ControlScheduler cs = new ControlScheduler(this);//WE NEED THIS.

        Observable.FromEventPattern(h => textBox1.TextChanged += h, 
                                    h => textBox1.TextChanged -= h)
                                     //^tell Rx about our event
            .Throttle(TimeSpan.FromMilliseconds(500), cs)///throttle
            .Do(a => SearchList(textBox1.Text))//do this method 
            .Subscribe();//this is where we tell it to begin all the magic
    }
    string[] list = new string[] { "gideon", "gabby", "joan", "jessica", "bob", "bill", "sam", "johann" };
    void SearchList(string query)
    {
        listBox1.Items.Clear();
        foreach (var item in list.Where(s => s.Contains(query)))
        {
            listBox1.Items.Add(item);
        }
    }
}