public IActionResult Login([FromBody]Data data)

$('#SignIn').click(function () {
                $('#SignIn').val('Please Wait');

               Ajax_Login();



            });
            function Ajax_Login() {

                var data = {
                    username: $('#Email').val().trim(),
                    password: $('#Password').val()
                };



                $.ajax({


                    type: "POST",
                    url: "/Upload/Login",
                    data: data,
                    contentType: "application/json",
                    dataType: "json",

                    success: function (message) {


                        alert(message);

                    },
                    error: function (message) {

                        alert(message);

                    }

public class Data
    {
        public string Username { get; set; }
        public string Password { get; set; }
    }


    [HttpPost]
    public IActionResult Login(Data data)
    {
        var message = data.Username + " and " + data.Password;

        return Json(message);
    }