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Silverlight uses a queue of work items to handle rendering and logic on the UI thread. Since your logic also runs on the UI thread (in your <code>button_Click</code> handler) the renderer doesn't get a chance to draw the screen until your method is done executing AND the internal message loop gets around to drawing the screen. Your <code>BeginInvoke</code> immediately places your function on the Silverlight work queue to execute on the UI thread (and returns immediately). The order Silverlight processes this is probably something like: <ul> <li>User clicks the button, placing a click event on the work queue</li> <li>Silverlight sees the click event and calls <code>button_Click</code> (which places a new action on the work queue)</li> <li>Process the next work queue item which is probably your <code>Thread.Sleep</code> action, pausing the UI thread for 5 seconds</li> <li>Finally Silverlight gets around to painting the screen</li> </ul> What you want to do is start a new thread to do your work, then <code>BeginInvoke</code> back to the UI thread: <pre><code>var thread = new Thread(() => { Thread.Sleep(5000); Dispatcher.BeginInvoke(() => { // update UI textBox.Text = "2"; }); }); textBox.Text = "1"; thread.Start(); </code></pre> I should add that Silverlight 5 adds a composition thread that can perform certain actions to update the UI without blocking the UI thread like playing animations and doing GPU accelerated rendering where possible.
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1. POMultiple asynchronous UI updates in Silverlight
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1. USRon Warholic
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1. USRon Warholic
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1. POMultiple asynchronous UI updates in Silverlight
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1. COThanks. Why can't I force the update with something like: { tb1.Text="1"; UpdateLayout(); Thread.Sleep(1000); tb2.Text="2"; } ?
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2. CO`UpdateLayout` only performs the [measure and arrange](http://msdn.microsoft.com/en-us/library/cc645025%28v=VS.95%29.aspx) steps of the layout process. The drawing still is scheduled through the work queue just like everything else. As far as I know there is no immediate mode screen rendering in Silverlight.
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