Query String

EG :
url : http://www.sareeshmg.blogspot.com?id=2"


<script language="javascript" type="text/javascript">
        function getQueryParams(qs) {
            qs = qs.split("+").join(" ");
            var params = {};
            var tokens,
        re = /[?&]?([^=]+)=([^&]*)/g;
            while (tokens = re.exec(qs)) {
                params[decodeURIComponent(tokens[1])]
            = decodeURIComponent(tokens[2]);
            }
            return params;
        }

        var $_GET = getQueryParams(document.location.search);

//To Capture query string value at aspx page use like this
        var TestID = $_GET['id'];

</script>

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ON Code behind aspx.cs page
to capture query string ID

int TestID = Convert.ToInt32(Request.QueryString["id"].ToString());