I have already solve it.. but i have new problem now..
Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Quantity='10' WHERE ProductCode='F01'' at line 7
This is my Code
$query = mysqli_query($con,"UPDATE product SET
ProductName='$_POST[PN]',
ProductClass='$_POST[PCL]',
ProductStatus='$_POST[PS]',
ProductPrice='$_POST[PP]',
ProductInPrice='$_POST[PI]'
Quantity='$_POST[Q]'
WHERE ProductCode='$_POST[PC]'");