Looking at the Reactive Extensions for javascript demo on Jeff Van Gogh's blog, I thought I'd give it a try in C#/Winforms, but it doesn't seem to work so well.

I just threw this into the constructor of a form (with the Rx framework installed and referenced):

Observable.Context = SynchronizationContext.Current;
var mousemove = Observable.FromEvent<MouseEventArgs>(this, "MouseMove");
var message = "Time flies like an arrow".ToCharArray();

for(int i = 0; i < message.Length; i++)
{
    var l = new Label() 
            { 
                Text = message[i].ToString(), 
                AutoSize = true, 
                TextAlign = ContentAlignment.MiddleCenter 
            };
    int closure = i;
    mousemove
        .Delay(closure * 150)
        .Subscribe(e => 
            {
                l.Left = e.EventArgs.X + closure * 15 + 10;
                l.Top = e.EventArgs.Y;
                //Debug.WriteLine(l.Text);
            });
    Controls.Add(l);
}

When I move the mouse, the letters seem to get moved in a random order, and if I uncomment the Debug line, I see multiple events for the same letter...

Any ideas? I've tried Throttle, but it doesn't seem to make any difference. Am I just asking too much of WinForms to move all those labels around?

(Cross posted on Rx Forum)