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   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   xmlns:ComponentModel="clr-namespace:System.ComponentModel;assembly=System"
   Title="WPF" Height="100" Width="200">
    
    
                    x:Key="backgroundWorker"
            WorkerReportsProgress="True"
            WorkerSupportsCancellation="True"
            DoWork="BackgroundWorker_DoWork"
            RunWorkerCompleted="BackgroundWorker_RunWorkerCompleted"
            ProgressChanged="BackgroundWorker_ProgressChanged"/>
    
    
    
        
        Start
    

//File:Window.xaml.cs
using System;
using System.ComponentModel;
using System.Threading;
using System.Windows;
using System.Windows.Input;
namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        private readonly BackgroundWorker worker;
        public Window1()
        {
            InitializeComponent();
            worker = this.FindResource("backgroundWorker") as BackgroundWorker;
        }
        private void button_Click(object sender, RoutedEventArgs e)
        {
            if(!worker.IsBusy)
            {
                this.Cursor = Cursors.Wait;
                worker.RunWorkerAsync();
                button.Content = "Cancel";
            }else{
                worker.CancelAsync();
            }
        }
        private void BackgroundWorker_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
        {
            for(int i = 1; i <= 100; i++)
            {
                if(worker.CancellationPending)
                    break;
                Thread.Sleep(100);
                worker.ReportProgress(i);
            }
        }
        private void BackgroundWorker_RunWorkerCompleted(object sender, System.ComponentModel.RunWorkerCompletedEventArgs e)
        {
            this.Cursor = Cursors.Arrow;
            Console.WriteLine(e.Error.Message);
            button.Content = "Start";
        }
        private void BackgroundWorker_ProgressChanged(object sender, System.ComponentModel.ProgressChangedEventArgs e)
        {
            progressBar.Value = e.ProgressPercentage;
        }
    }
}