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copied!<p>It is not clear from your post whether you are aware that you must modify UI elements on the UI thread - or you will have problems. Here is a brief example which creates a background thread which modifies a TextBox with the current time.</p> <p>The key is MyTextBox.Dispather.BeginInvoke in Page.xaml.cs.</p> <p>Page.xaml:</p> <pre><code><UserControl x:Class="App.Page" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="400" Height="300" Loaded="UserControl_Loaded"> <Grid x:Name="LayoutRoot"> <TextBox FontSize="36" Text="Just getting started." x:Name="MyTextBox"> </TextBox> </Grid> </UserControl> </code></pre> <p>Page.xaml.cs:</p> <pre><code>using System; using System.Windows; using System.Windows.Controls; namespace App { public partial class Page : UserControl { public Page() { InitializeComponent(); } private void UserControl_Loaded(object sender, RoutedEventArgs e) { // Create our own thread because it runs forever. new System.Threading.Thread(new System.Threading.ThreadStart(RunForever)).Start(); } void RunForever() { System.Random rand = new Random(); while (true) { // We want to get the text on the background thread. The idea // is to do as much work as possible on the background thread // so that we do as little work as possible on the UI thread. // Obviously this matters more for accessing a web service or // database or doing complex computations - we do this to make // the point. var now = System.DateTime.Now; string text = string.Format("{0}.{1}.{2}.{3}", now.Hour, now.Minute, now.Second, now.Millisecond); // We must dispatch this work to the UI thread. If we try to // set MyTextBox.Text from this background thread, an exception // will be thrown. MyTextBox.Dispatcher.BeginInvoke(delegate() { // This code is executed asynchronously on the // Silverlight UI Thread. MyTextBox.Text = text; }); // // This code is running on the background thread. If we executed this // code on the UI thread, the UI would be unresponsive. // // Sleep between 0 and 2500 millisends. System.Threading.Thread.Sleep(rand.Next(2500)); } } } } </code></pre> <p>So, if you want to get things asynchronously, you will have to use Control.Dispatcher.BeginInvoke to notify the UI element that you have some new data.</p>

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