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Implementing the DoWork event

<UserControl x:Class='SilverlightApplication3.MainPage'     xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'      xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'     xmlns:d='http://schemas.microsoft.com/expression/blend/2008'      xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'      mc:Ignorable='d'      d:DesignWidth='640'      d:DesignHeight='480'>     <Grid x:Name="LayoutRoot" Background="White">         <StackPanel Orientation="Vertical">                         <ProgressBar x:Name="myProgressBar" Height="30" Width="250" Background="White" BorderBrush="Black" BorderThickness="2">                 <ProgressBar.Foreground>                     <LinearGradientBrush EndPoint="0.5,1.35" StartPoint="0.5,-0.3">                         <GradientStop Color="#FF67E206" Offset="0"/>                         <GradientStop Color="#FF209900" Offset="0.418"/>                         <GradientStop Color="#FF67E206" Offset="1"/>                     </LinearGradientBrush>                 </ProgressBar.Foreground>             </ProgressBar>         </StackPanel>     </Grid> </UserControl> //File: Page.cs using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; using System.ComponentModel; using System.Threading; namespace SilverlightApplication3 {     public partial class MainPage : UserControl     {         private BackgroundWorker backgroundWorker = null;                                  public MainPage()         {             InitializeComponent();             backgroundWorker = new BackgroundWorker();             backgroundWorker.DoWork +=new DoWorkEventHandler(backgroundWorker_DoWork);                 backgroundWorker.RunWorkerAsync();                                               }         void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)         {            for (int i = 1; i <= 100; i++)                                                       {                                                                                        Thread.Sleep(25);                                                                  }         }     } }