Asp.Net Developer

<%@ Page Language="C#"%>

<% User us = new User();
   bool result;

   if (Request["ctl00$ContentPlaceHolder1$txtusername"] != null)
   {
       result = us.checkUserAvailability(Request["ctl00$ContentPlaceHolder1$txtusername"].ToString(), "username");
       if (result)
       {
           Response.Write("true");
       }
       else
           Response.Write("false");
   }
   else if (Request["ctl00$ContentPlaceHolder1$txtemail"] != null)
   {
       result = us.checkUserAvailability(Request["ctl00$ContentPlaceHolder1$txtemail"].ToString(), "email");
       if (result)
       {
           Response.Write("true");
       }
       else
           Response.Write("false");
   }
   
 %>

source code :

<script type="text/javascript" language="javascript">
        $().ready(function() {
            $("#aspnetForm").validate({
                rules: {
                    ctl00$ContentPlaceHolder1$txtfirstname: {
                        required: true
                    },
                    ctl00$ContentPlaceHolder1$txtlastname: {
                        required: true
                    },
                    ctl00$ContentPlaceHolder1$txtpassword: { required: true, minlength: 5 },
                    ctl00$ContentPlaceHolder1$txtemail: {
                        required: true,
                        remote: "Controller/checkUserAvail.aspx",
                        email: true
                    },
                    ctl00$ContentPlaceHolder1$txtaddress1: { required: true }
                },
                messages: {
                    ctl00$ContentPlaceHolder1$txtfirstname: {
                        required: "<br/>Please enter First Name"
                    },
                    ctl00$ContentPlaceHolder1$txtlastname: {
                        required: "<br/>Please enter Last Name"
                    },
                    ctl00$ContentPlaceHolder1$txtpassword: {
                        required: "<br/>Please enter a password",
                        minlength: "<br/>Minimum password length is 5 characters"
                    },
                    ctl00$ContentPlaceHolder1$txtemail: {
                        required: "<br/>Please enter a email",
                        email: "<br/>Please enter a valid email",
                        remote: jQuery.format("<br/>Email address is already in use")
                    },
                    ctl00$ContentPlaceHolder1$txtaddress1: { required: "<br/>Please enter address"
                    }
                }
            });
        });         
    </script>

Thank
Rajesh singh