to catch the query string value using javascript

to catch the query string value using javascript

window.location.href = "Default2.aspx?username=" + txtusername;

in the reading page.aspx

 var query = location.search.substring(1)   //you get the username=somename in query variable so you need to split
        
            var str = query.split('=');
            alert(str[0]);  //username
            alert(str[1]); // somename