.Net WinForm Code：
using System;
using System.Collections.Generic;
using System.ComponentModel;////
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
namespace BackgroundWorkerSample
{
public partial class CalculateAddForm : Form
{
protected BackgroundWorker backgroundWorker1 = new BackgroundWorker();
//private int numberToCompute = 0;
//private int highestPercentageReached = 0;
public CalculateAddForm()
{
InitializeComponent();
InitializeBackgoundWorker();
}
// Set up the BackgroundWorker object by
// attaching event handlers.
private void InitializeBackgoundWorker()
{
this.backgroundWorker1.WorkerReportsProgress = true;
this.backgroundWorker1.WorkerSupportsCancellation = true;
this.backgroundWorker1.DoWork += new DoWorkEventHandler(backgroundWorker1_DoWork);
this.backgroundWorker1.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker1_ProgressChanged);
this.backgroundWorker1.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backgroundWorker1_RunWorkerCompleted);
}
private long ComputeAdd(int n, BackgroundWorker worker, DoWorkEventArgs e)