Why does my Progressbar percentage disappear .. c#

Question

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Hi
My progressbar perecentage disappears when the progressbar updates why is this?

CODE:

C#

public void PBPercentage()
      {

          int percent = (int)(((double)(progressBar1.Value - progressBar1.Minimum) / (double)(progressBar1.Maximum - progressBar1.Minimum)) * 100);
          using (Graphics gr = progressBar1.CreateGraphics())
          {
              gr.DrawString(percent.ToString() + "%", SystemFonts.DefaultFont, Brushes.Black,
              new PointF(progressBar1.Width / 2 - (gr.MeasureString(percent.ToString() + "%",
              SystemFonts.DefaultFont).Width / 2.0F),
              progressBar1.Height / 2 - (gr.MeasureString(percent.ToString() + "%",
               SystemFonts.DefaultFont).Height / 2.0F)));


          }
      }

Posted 3-Mar-14 9:35am

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Sergey Alexandrovich Kryukov · Answer 1 · 2014-03-03T10:21:00

Because you graphics is volatile. You should not draw using the instance of System.Drawing.Graphics you create. Instead, you should do it in an overridden method System.Windows.Forms.Control.OnDraw or your handler of the event System.Windows.Forms.Control.Draw and use the Graphics instance passed in the event arguments parameter. Please see my past answers:
What kind of playful method is Paint? (DataGridViewImageCell.Paint(...))[^],
capture the drawing on a panel[^],
Drawing Lines between mdi child forms[^],
How to speed up my vb.net application?[^].

—SA