namespace BackgroundWorker

{

    public partial class frmMain : Form

    {

        public bool FLAG = true;

        public long MAX = 200000000;

        public frmMain()

        {

            InitializeComponent();

        }

        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)

        {

            int i = 1;

            for (long l = 0; l < MAX; l++)

            {

                if (l == (long)(MAX / 100) * i)

                {

                    backgroundWorker1.ReportProgress(i);

                    i++;

                }

                if (backgroundWorker1.CancellationPending)

                {

                    e.Cancel = true;

                    return;

                }

            }

        }

        private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)

        {           

            prgsBar.Value = e.ProgressPercentage;

            lblReport.Text = "شمارش در حال انجام است لطفا بردباری کنید  " + "( " + e.ProgressPercentage.ToString() + "

            درصد" + " ) ";

            this.Update();

        }

        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)

        {

            lblReport.Visible = false;

            prgsBar.Visible = false;

            btnCountStop.Text = "شمارش";

            FLAG = true;           

        }

        private void btnMsg_Click(object sender, EventArgs e)

        {

            MessageBox.Show("برنامه به درخواست کاربر پاسخ می دهد", "نمایش پیام", MessageBoxButtons.OK,

            MessageBoxIcon.Asterisk);

        }

        private void btnCountStop_Click(object sender, EventArgs e)

        {

            if (FLAG)

            {

                lblReport.Visible = true;

                prgsBar.Visible = true;

                btnCountStop.Text = "انصراف";

                toolTip1.SetToolTip(this.btnCountStop, "Cancel");

                backgroundWorker1.RunWorkerAsync();

                FLAG = false;

            }

            else

            {

                lblReport.Visible = false;

                prgsBar.Visible = false;

                btnCountStop.Text = "شمارش";

                toolTip1.SetToolTip(this.btnCountStop, "Counting");

                backgroundWorker1.CancelAsync();                  

                FLAG = true;

            }

        }

        private void btnExit_Click(object sender, EventArgs e)

        {

            this.Close();

        }

    }

}