Profile Editing.

PHP Code:

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<?php
         if(isset($_POST["update"]))
         {
            //echo'<pre>';print_r($_POST);exit();
            //$user_name =$_POST["name"];
            $conn = mysqli_connect("localhost", "root", "", "videos") or die("Connection to Server failed!" . mysqli_error());
            $query = mysqli_query("SELECT * from users WHERE Id='$_POST[Id]'");
            $username = $_Get[$query('Username')];
            $email = $_Get[$query('Email')];
            $employee = $_Get[$query('EmployeeID')];
            $designation = $_Get[$query('Designation')];
            $password = $_Get[$query('Password')];
            $id =$_Get['Id'];
            // Connect to server and select database.
            // $conn = mysqli_connect("localhost", "root", "", "videos") or die("Connection to Server failed!" . mysqli_error());
            // $selet = mysqli_select_db("first_db", "root", "") or die("Cannot connect to database");
             //echo $query;exit(); 
            $result = mysqli_query($query);
            $rows = mysqli_num_rows($result);
            //     //echo'USER EXIST'; 
            if ($rows==$id)
            { 
                while($rs = mysqli_fetch_array($result))
                {
                     $username = $rs["Username"]; 
                     $email = $rs["Email"];
                     $employee =$rs["EmployeeID"];
                     $designation=$rs["Designation"];
                     $password=$rs["Password"];
                }
            }
             $query = mysqli_query($conn, "UPDATE users SET Username='$name', Email='$email', EmployeeID='$employee', Designation='$designation', Password='$password' WHERE Id='$id'");
            $result = mysqli_query($query); 
             if($result==false)
            {
                    die(mysqli_error()); 
            }
            header("Location: settings.php"); 
            return mysqli_affected_rows();
            //echo'<pre>';print_r($result);exit();
            exit();
    }
?>

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This is my php code for profile editing of users by admin. I have added "value" element in expected fields my html form. But still I am unable to fetch the data into those form fields. for example, I am getting following error in expected field:

Code:

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<br /><b>Notice</b>: Undefined variable: username in <b>C:\xampp\htdocs\VS\edit.php</b> on line <b>120</b><br />

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I am fresher for php. I hope that I will get solution immidiately from experts in this forum.

Thank You,