c# - Coordinate Mismatch Problem -

1. loaded jpg picture box (in size mode zoomed).
2. i drawn rectangle on picture box , taken coordinate.
3. opens jpg in paint , observed coordinate (where drawn rectangle on picture box). when compare rectangle coordinate(x , y) paint coordinate not same.

i changed size mode normal , observed coordinates same image size large display partially. use zoom size mode property.

say image size 2825x3538 , keep picture box size mode normal, image shows partially in picture box. changed picture box mode zoom (to fit system screen resolution). , coordinate miss matched when compare normal mode zoom mode.

how can achieve same coordinates.

private void opentoolstripmenuitem_click(object sender, eventargs e)         {
  
        openfd.filename = "";         openfd.title = "open image";         openfd.initialdirectory = "c";         openfd.filter = "jpeg|*.jpg|bmp|*.bmp|all files|*.*.*";         if (openfd.showdialog() == dialogresult.ok)         {             file = openfd.filename;              image = image.fromfile(file);             picturebox1.image = image;               svc = screen.primaryscreen;             picturebox1.width = svc.bounds.width;             picturebox1.height = svc.bounds.height-100;              mybitmap1 = new bitmap (picturebox1.image);             mybitmap1.setresolution(300, 300);             picturebox1.image = mybitmap1;           }      } 
  
private void picturebox1_mousedown(object sender, mouseeventargs e)         {     if (mybitmap == null)                 {                     mybitmap = new bitmap(picturebox1.width, picturebox1.height);                     mybitmap.setresolution(300, 300);                 }          }
  
private void picturebox1_paint(object sender, painteventargs e)         {
   using (g = graphics.fromimage(mybitmap))             {                      using (pen pen = new pen(color.green, m))                   {         e.graphics.drawrectangle(pen, r);                              e.graphics.drawstring(lab[c].tostring(), new font(lab[c].tostring(), 8f), new solidbrush(label1.forecolor), r);         } }       }