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POChange button color from other thread
 

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    <p>In my c# program I create a bunch of buttons in the main (UI) thread. Then I start a timer that runs a method <code>Timeline()</code>. Now I want the appearance of the buttons to change when the <code>Timeline()</code> method runs. But I'm not allowed to access the objects because they are owned by the main thread. How do I solve this?</p> <p>Error: <code>The calling thread cannot access this object because a different thread owns it.</code></p> <p>I have found <code>Dispatcher disp = Dispatcher.CurrentDispatcher;</code> which has an <code>Invoke()</code> method but I'm not sure if that is the right way, and I couldn't get it to work.</p> <p>Here is part of my code:</p> <pre><code> private static SurfaceButton[,] buttons = new SurfaceButton[dimensionBeats, dimensionsNotes]; public SurfaceWindow1() { try { InitializeComponent(); } catch (Exception ex) { } LoadAudioContent(); // Add handlers for Application activation events AddActivationHandlers(); InitializeButtons(); try { t = new Timer(Timeline, null, 1, dimensionBeats*500); } catch (Exception e) { } } private void InitializeButtons() { for (int i = 0; i &lt; 8; i++) { for (int j = 0; j &lt; 6; j++) { SurfaceButton btn = new SurfaceButton(); //btn.Content = files[j].Substring(0,1); btn.Name = "a" +i + j; btn.Width = 120; btn.Height = 120; btn.ContactEnter+=StartSound; btn.ContactLeave+=StopSound; btn.Opacity = 0.01; btn.ClickMode = ClickMode.Release; buttons[i,j] = btn; // add the newly generated button to the correct column (left to right one panel per column) switch (i) { case 0: rowPanel0.Children.Add(btn); break; case 1: rowPanel1.Children.Add(btn); break; case 2: rowPanel2.Children.Add(btn); break; case 3: rowPanel3.Children.Add(btn); break; case 4: rowPanel4.Children.Add(btn); break; case 5: rowPanel5.Children.Add(btn); break; case 6: rowPanel6.Children.Add(btn); break; case 7: rowPanel7.Children.Add(btn); break; } } } } private void Timeline(Object state) { for (int i = 0; i &lt; pressed.GetLength(0); i++) { sendRequest(url, postMethod, tabelId, buttsToString(butts)); for (int j = 0; j &lt; pressed.GetLength(1); j++) { if (pressed[i,j]) { buttons[i, j].Background = Brushes.Red; } } Thread.Sleep(500); for (int j = 0; j &lt; pressed.GetLength(1); j++) { buttons[i, j].Background = Brushes.White; } } </code></pre>
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    1. COThis should answer your question: <http://stackoverflow.com/questions/142003/cross-thread-operation-not-valid-control-accessed-from-a-thread-other-than-the?rq=1>
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    2. COFollowing page gives you a good solution. [Best Way to Invoke Any Cross-Threaded Code][1] [1]: http://stackoverflow.com/questions/711408/best-way-to-invoke-any-cross-threaded-code/711419
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    3. COIs this WPF or WinForms?
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