login and password not working

[vineet]

hi all i have a login form with user name and password. The user name field is called "user_name" and password field is called "password".
I have applied the code.
I m filing the right user and password.
In the database i have user_id, user_name, password.
neither an error is coming nor its redirectig it.

require_once("../config.php");

$msg="";
if(isset($_REQUEST['id']))
{
$id=$_REQUEST['id'];
$qry="select * from admin_table where user_id='$id'";
$result=mysql_query($qry);
$row=mysql_fetch_array($result);


}

if(isset($_REQUEST['submit']))
{

	$user_name=$_REQUEST['user_name'];
	$password=$_REQUEST['password'];

	$qry="select * from admin_table WHERE user_name='$user_name' and password='$password'"; 
	//echo $qry;
	
	$result=mysql_query($qry);
	
	if(mysql_num_rows($result)>0)
	{
	
		if(($user_name==$row['user_name']) && ($password==$row['password']))
		
		{
			header("Location: control_panel.php");
		}
		else
		{
		$msg="Login ID or password is incorrect";
		}
	}
}

[rangana]

It's your responsibility to die().

You can never see error, since you're not instructing the code to show any:

$result=mysql_query($qry) or die(mysql_error());