ajax asp.net core

@section scripts{ <script>    document.forms[0].onsubmit = () => {        let formData = new FormData(document.forms[0]);        var xhr = new XMLHttpRequest();        xhr.onreadystatechange = function() {            if (this.readyState === 4 && this.status === 200) {                alert('Posted using XMLHttpRequest');            }        };        xhr.open('post', '', true);        xhr.send(new URLSearchParams(formData));        return false;    };</script>}