calling generic handler using jquery in asp.net

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C#

ASP.NET

Hi all,
I need to call a handler (ashx) file from jQuery to fetch some data at runtime. My jQuery function looks like:

<script src="./Scripts/Jcrop/js/jquery.min.js" type="text/javascript"></script>
<script language="javascript" type="text/javascript">
     $("#txtCardHolderName_LL").keyup(function () {

            $.ajax({
                url: "HandlerHinditoEnglish.ashx",
                type: "POST",

                success: function (data) {
                    alert(data);

                },
                error: function (data) {
                    alert("Error");
                }
            });
        });
    </script>

Handler code

public void ProcessRequest(HttpContext context)
   {
       context.Response.ContentType = "text/plain";
       context.Response.Write("Hello World");
   }

   public bool IsReusable
   {
       get
       {
           return false;
       }
   }

But it is not firing on key up of textbox please help i need to all handler function onkeyup of my textbox.