BackgroundWorker, где ошибка? - C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
//using System.Threading.Tasks;
using System.Windows.Forms;
using System.Threading;
 
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            button1.Click += button1_Click;
            button2.Click += button2_Click;
            backgroundWorker1.DoWork += backgroundWorker1_DoWork;
            backgroundWorker1.ProgressChanged += backgroundWorker1_ProgressChanged;
            backgroundWorker1.RunWorkerCompleted += backgroundWorker1_RunWorkerCompleted;
        }
 
        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            for (int i = 0; i <= 99;i++ )
            {
                if(backgroundWorker1.CancellationPending)
                {
                    e.Cancel = true;
                    break;
                }
                backgroundWorker1.ReportProgress(i);
                Thread.Sleep(50);
            }
 
        }
 
        private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            progressBar1.Value = e.ProgressPercentage + 1;
            progressBar1.Value = e.ProgressPercentage;
        }
 
        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            string message = e.Cancelled ? "Процесс отмкнен" : "Процесс завершон!";
            MessageBox.Show(message);
            button1.Enabled = true;
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            button1.Enabled = false;
            backgroundWorker1.RunWorkerAsync();
            
        }
 
        private void button2_Click(object sender, EventArgs e)
        {
            backgroundWorker1.CancelAsync();
 
        }
    }
}