Create and Consume custom asp.net Web Service in SharePoint 2010 using Jquery

follow below steps to create a asp.net web service

http://msmvps.com/blogs/windsor/archive/2011/11/04/walkthrough-creating-a-custom-asp-net-asmx-web-service-in-sharepoint-2010.aspx

http://msdn.microsoft.com/en-us/library/ms464040.aspx

you can download the webservice code from here. 

https://drive.google.com/folderview?id=0B_OpLHHlwhiRazcyVFBTelFSQnM&usp=sharing

you just need to change the site url. for this select project and press F4 then it will show properties window. right click deploy it.

I am consuming this webservice using jquery. 

Please this code below this tag

<asp:Content ContentPlaceHolderId="PlaceHolderMain" runat="server">

Update web service url and soap message as well.

<script src="/shared%20documents/jquery-1.8.2.min.js" type="text/javascript"></script>

    <script language="javascript">

        $(document).ready(function () {

            alert();

            var soapMessage = '<?xml version="1.0" encoding="utf-8"?> \

<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">\

  <soap12:Body>\

    <GetSiteListCount xmlns="http://tempuri.org/" />\

  </soap12:Body>\

</soap12:Envelope>'

            $.ajax({

                url: "http://spdev5:8004/_layouts/webservicedemo/mycustomws.asmx?op=GetSiteListCount",

                type: "POST",

                dataType: "xml",

                data: soapMessage,

                processData: false,

                contentType: "text/xml; charset=\"utf-8\"",

                success: OnSuccess,

                error: OnError

            });

        });

        function OnSuccess(data, status) {

            alert(data.text);

        }

        function OnError(request, status, error) {

            alert('error' + request + status + error);

        }</script>