asp.net jquery ajax

<script type="text/javascript" src="js/jquery-1.4.2.min.js"></script>
   <script type="text/javascript">
        $(document).ready(function(){
             $("#btn1").click(
                function(){                  
                     $.ajax({
                      type:"POST",
                      url:"ajaxTest.aspx",
                      data:"name=jack",
                      success:function(data){
                        alert(data);
                      }
                     });
                }
             );
       
        });
   </script>