PHP หน้า edit record ค่าเก่าไม่ขึ้นครับ ช่วยชี้แนะด้วยครับ

<form action="phpEditSave.php?PartID=<?php echo $_GET["PartID"];?>" name="frmEdit" method="post">



<?php
$objConnect = mysql_connect("localhost","root","admin") or die("Error Connect to Database");
$objDB = mysql_select_db("inventory");
$strSQL = "SELECT * FROM machinemaster WHERE PartID = '".$_GET["PartID"]."' ";
$objQuery = mysql_query($strSQL)or die(mysql_error()."[$strSQL]");



if(!$objQuery)
{
	echo "Not found PartID=".$_GET["PartID"];
}
else
{
?>


<table width="600" border="1">
  <tr>
    <th width="91"> <div align="center">PartID</div></th>
    <th width="160"> <div align="center">Partcode</div></th>
    <th width="198"> <div align="center">PartType</div></th>
    <th width="97"> <div align="center">partname</div></th>
    <th width="70"> <div align="center">partModel</div></th>
    <th width="70"> <div align="center">PartQTY</div></th>
  </tr>
  <tr>
  
    <td><div align="center"><input type="text" name="txtPartID" size="5" value="<?php echo $objResult["PartID"]; ?>"></div></td>
    
    <td><input type="text" name="txtPartcode" size="20" value="<?php echo $objResult["Partcode"];?>"></td>
    <td align="right"><input type="text" name="txtPartType" size="20" value="<?php echo $objResult["PartType"];?>"></td>
    <td><div align="center"><input type="text" name="txtpartname" size="2" value="<?php echo $objResult["partname"];?>"></div></td>
    <td align="right"><input type="text" name="txtpartModel" size="5" value="<?php echo $objResult["partModel"];?>"></td>
    <td align="right"><input type="text" name="txtPartQTY" size="5" value="<?php echo $objResult["PartQTY"];?>"></td>
  </tr>
  </table>
  <input type="submit" name="submit" value="submit">
  <?php
  }
  mysql_close($objConnect);
  ?>
  </form>
  

</body></html>