how to call handler class when we click on button

Question

Hi,
 
How to call handler class(.ashx) when we click on button.
 I added the following code button click event is firing but how to call the handler class. Please help me.

    <title></title>

    <script src="JScripts/jquery-1.10.2.js"></script>

         <script type="text/javascript">

             $(document).ready(function () {

                 $(".btn").click(function () {

                     ('Handler1.ashx);

                 });

                 

             });

         </script>

</head>