Asp.net Load jquery if not available

           const string jqueryScript = @"
                             if(typeof jQuery=='undefined') {
                                var jqTag = document.createElement('script');
                                jqTag.type = 'text/javascript';
                                jqTag.src = 'http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js';
                                document.body.appendChild(jqTag);} ";
            Page.ClientScript.RegisterStartupScript(GetType(),"jqueryCheck",jqueryScript,true);