WPF C# Tutorial

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF" Height="100" Width="200">
    
        
        
            Start
        
    


//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.WorkerSupportsCancellation = 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){
            if(!worker.IsBusy)
            {
                this.Cursor = Cursors.Wait;
                worker.RunWorkerAsync();
                button.Content = "Cancel";
            }else{
                worker.CancelAsync();
            }
        }
        private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            this.Cursor = Cursors.Arrow;
            if(e.Cancelled)
            {
                MessageBox.Show("Operation was canceled");
            }
            else if(e.Error != null)
            {
                MessageBox.Show(e.Error.Message);
            }
            button.Content = "Start";
        }
        private void worker_DoWork(object sender, DoWorkEventArgs e)
        {
            for(int i = 1; i <= 100; i++)
            {
                if(worker.CancellationPending)
                {
                    e.Cancel = true;
                    return;
                }
                Thread.Sleep(100);
                worker.ReportProgress(i);
            }
        }
        private void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            progressBar.Value = e.ProgressPercentage;
        }
    }
}