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Execute a Method Asynchronously Using a Background Worker Thread

<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" Width="240" Height="140" >     <StackPanel>         <Button Click="Start_Click" Name="btnStart">Start</Button>         <TextBlock Name="txtBiggestPrime"/>     </StackPanel> </Window> //File:Window.xaml.cs using System; using System.Windows; using System.ComponentModel; namespace WpfApplication1 {     public partial class Window1 : Window     {         private BackgroundWorker worker = new BackgroundWorker();         private long from= 1;         private long to = 200;         private long biggestPrime;         public Window1(): base()         {             InitializeComponent();             worker.DoWork += new DoWorkEventHandler(worker_DoWork);             worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);         }         private void Start_Click(object sender, RoutedEventArgs e)         {             worker.RunWorkerAsync();             btnStart.IsEnabled = false;             txtBiggestPrime.Text = string.Empty;         }         private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)         {             btnStart.IsEnabled = true;             txtBiggestPrime.Text = biggestPrime.ToString();         }         private void worker_DoWork(object sender, DoWorkEventArgs e)         {             for(long current = from; current <= to; current++)             {                 biggestPrime = current;             }         }     } }