How to use refresh progress bar in C#

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C#

.NET

WinForms

I am using a progress bar but it not refreshing though I use refresh function.

if (progressBar.Value == 100)
     {
        progressBar.Value = 0;
        lblProgressPercentage.Text = string.Empty;
     }

 if (ofd.ShowDialog() != DialogResult.Cancel)
    {
        int singleBlock = 100 / ofd.FileNames.Count();

        for (int i = 0; i < ofd.FileNames.Count(); i++)
        {
            ----------------------
                Statements
            ----------------------
        }
progressBar.Value += singleBlock;
                    lblProgressPercentage.Text = progressBar.Value.ToString() + "% Processed";

                    int percent = (int)(((double)progressBar.Value / (double)progressBar.Maximum) * 100);
                    progressBar.CreateGraphics().DrawString(percent.ToString() + "%", new Font("Arial", (float)8.25, FontStyle.Regular), Brushes.Black, new PointF(progressBar.Width / 2 - 10, progressBar.Height / 2 - 7));
                    progressBar.Refresh();
                    System.Threading.Thread.Sleep(2000);
}

Whenever do this the progress bar not filling to corresponding value.

It works only if the statement exits.
Even label is not get updated.


How to solve this.