A generic error occurred in GDI+ and The process cannot access the file...

I have a database that stores data on a server and use directory as a placeholder for .jpg files. In this application, I store images in folders instead of using BLOB data type, so there is a correspondence between each record with image files, and also there are references to several fields with their corresponding image file.

When viewing the data in the DataGridView, images should be shown in Picture Box, using this function.

private void NextPrevRow()
{
  DataRowView drv = (DataRowView)bindSrc0.Current;
  if (drv == null) return;
  string fname = myGlobVar.UNC + "\\f"+drv["pk"].ToString().Trim()+".jpg";
  if (System.IO.File.Exists(fname))
  {
    try
    {
      fotobox.Image = System.Drawing.Image.FromFile(fname);
    }
    catch { }
  }
  else
    fotobox.Image = null;
}

If a user wants to link an image with a record, he chose the image file first and then clicking the save button.
The following function will save the bitmap image that is displayed in the Picture Box as an image file in the directory of the server.

private void SaveImageToFile()
{
  DataRowView drv = (DataRowView)bindSrc0.Current;
  if (fotobox.Image != null)
  {
    string fname = myGlobVar.UNC + "\\f" + drv["pk"].ToString().Trim() + ".jpg";
    try
    {
      if (File.Exists(fname))
        File.Delete(fname);
      fotobox.Image.Save(fname, ImageFormat.Jpeg);
    }
    catch (Exception ex)
    {
      MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
    }
  }
}

Make changing of the image, will raise an error The process cannot access the file '\\10.11.12.13\\f128.jpg' because it is being used by another process.
It occurs when use fotobox.Image = System.Drawing.Image.FromFile(fname); line number 10 of NextPrevRow()function, and these commands in SaveImageToFile() function:

if (File.Exists(fname))
File.Delete(fname);
fotobox.Image.Save(fname, ImageFormat.Jpeg);

If I remark commands to delete files, and leave Save command only in SaveImageToFile() function, an error thrown: A generic error occurred in GDI+.

I modify the commands, error messages about file locking does not exist anymore.

private void NextPrevRow()
{
  DataRowView drv = (DataRowView)bindSrc0.Current;
  if (drv == null) return;
  string fname = myGlobVar.UNC + "\\f"+drv["pk"].ToString().Trim()+".jpg";
  if (System.IO.File.Exists(fname))
  {
    try
    {
      FileStream fs = File.OpenRead(fname);
      byte[] data = new byte[fs.Length];
      fs.Read(data, 0, data.Length);
      fs.Close();

      MemoryStream ms = new MemoryStream(data);
      Bitmap bmp = new Bitmap(ms);
      fotobox.Image = bmp;
      ms.Close();
    }
    catch { }
  }
  else
    fotobox.Image = null;
}


private void SaveImageToFile()
{
  DataRowView drv = (DataRowView)bindSrc0.Current;
  if (fotobox.Image != null)
  {
     string fname = myGlobVar.UNC + "\\f" + drv["pk"].ToString().Trim() + ".jpg";
     try
     {
       // if (File.Exists(fname))
          // File.Delete(fname);
       fotobox.Image.Save(fname, ImageFormat.Jpeg);
     }
     catch (Exception ex)
     {
        MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
     }
  }
}