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Use BackgroundWorker to run task at background

<Window x:Class="WpfApplication1.Window1"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="WPF" Height="100" Width="200">     <StackPanel>         <ProgressBar Name="progressBar" Margin="4"/>         <Button Name="button" Click="button_Click">Start</Button>     </StackPanel> </Window> //File:Window.xaml.cs using System.ComponentModel; using System.Threading; using System.Windows; using System.Windows.Input; namespace WpfApplication1 {     public partial class Window1 : Window     {         private BackgroundWorker worker = new BackgroundWorker();         public Window1()         {             InitializeComponent();             worker.WorkerReportsProgress = true;             worker.DoWork += new DoWorkEventHandler(worker_DoWork);             worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);             worker.ProgressChanged += worker_ProgressChanged;         }         private void button_Click(object sender, RoutedEventArgs e)         {             worker.RunWorkerAsync();             this.Cursor = Cursors.Wait;             button.IsEnabled = false;         }         private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)         {             this.Cursor = Cursors.Arrow;             if(e.Error != null)                 MessageBox.Show(e.Error.Message);             button.IsEnabled = true;         }         private void worker_DoWork(object sender, DoWorkEventArgs e)         {             for(int i = 1; i <= 100; i++)             {                 Thread.Sleep(100);                 worker.ReportProgress(i);             }         }         private void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)         {             progressBar.Value = e.ProgressPercentage;         }     } }