pictureBox

Problem is that the image in picture still holds a handle to the file. Try to dispose the the image first:

Image img = pictureBox1.Image;
pictureBox1.Image = null;
at this point there should be no other references to the image
img.Dispose();
img = null;
// Try to do file deletion now
File.Delete(str);

Hope that helps!

Best Regards,
Manfred

This is by design.

See http://support.microsoft.com/kb/309482[^]

I have to comment on my previous question and the answered that I have chosen
The answer were good if the pictureBox1 is attached to only one image file
But
If the the pictureBox1 is attached to more than one file , I still can not delete those image files
Therefore I preferred to use the filestream method, I used it and it were much better than the
following

pictureBox1.Image = Image.FromFile(FruitName[0]+".jpg");
img = pictureBox1.Image;
pictureBox1.Image = null;
img.Dispose();
img = null;
if(File.Exists(FruitName[0] + ".jpg")) File.Delete(FruitName[0]+".jpg");
//------End------------------------------------------------------------------------

The following is much better

Private void UpButtonClick((object sender, EventArgs e)
{
j=…..
fs = new System.IO.FileStream(FruitName[j]+ ".jpg", FileMode.Open, FileAccess.Read);
pictureBox1.Image = System.Drawing.Image.FromStream(fs);
fs.Close();
}
Private void DownButtonClick((object sender, EventArgs e)
{
   j=…..
   fs = new System.IO.FileStream(FruitName[j] + ".jpg", FileMode.Open, FileAccess.Read);
   pictureBox1.Image = System.Drawing.Image.FromStream(fs);
   fs.Close();
}

private void ExitClick(object sender, EventArgs e)
{
   for (i = 0; i < TotalFruit; i++)
   {
      if(File.Exists(FruitName[i] + ".jpg"))
      File.Delete(FruitName[i] + ".jpg");
   }
      
   Application.Exit();
}