如何在mvc中将值从AJAX传递到codebehind呢?字符串值为空。

$(document).ready(function () {      
    $("#btn").click(function () {         
        var data = {
            "Username": $("#name").val(),
            "Password":$("#pswd").val()
        }  
        $.ajax({
            url: "/loginform/logdetail",
            data: JSON.stringify(data),
            type: "post",
            ContentType: "application/json;charset=utf-8",            
            datatype: "json", 
            success: function (response) {
                event.preventDefault();
                var result = JSON.parse(response.d);
                if (result.status == "success") {
                    window.location = "https://www.google.co.in";
                    return false;
                }    
            },
            error: function (result) {
                alert("errormessage");
            }
        })   
    });
});
$(document).ready(function () {      
    $("#b