public partial class frmProcessBar : Form

    {

        public frmProcessBar()

        {

            InitializeComponent();

        }

        public bool Increase(int nValue)

        {

            if (nValue > )

            {

                if (progressBar1.Value + nValue < progressBar1.Maximum)

                {

                    progressBar1.Value += nValue;

                    return true;

                }

                else

                {

                    progressBar1.Value = progressBar1.Maximum;

                    this.Close();

                    return false;

                }

            }

            return false;

        }

    }

private frmProcessBar myProcessBar = null;

        private delegate bool IncreaseHandle(int nValue);

        private IncreaseHandle myIncrease = null;

private void btnRun_Click(object sender, EventArgs e)

        {

            Thread thdSub = new Thread(new ThreadStart(ThreadFun));

            thdSub.Start();

        }

        private void ShowProcessBar()

        {

            myProcessBar = new frmProcessBar();

            // Init increase event

            myIncrease = new IncreaseHandle(myProcessBar.Increase);

            myProcessBar.ShowDialog();

        }

        private void ThreadFun()

        {

            MethodInvoker mi = new MethodInvoker(ShowProcessBar);

            this.BeginInvoke(mi);

            bool blnIncreased = false;

            object objReturn = null;

            do

            {

                Thread.Sleep();

                objReturn = this.Invoke(this.myIncrease,new object[] {  });

                blnIncreased = (bool)objReturn;

            }

            while (blnIncreased);

        }