function testingFunction() {
    var obj = $('testForm').serialize();

    $.ajax({
        url: '@Url.Action("TestingFunction", "BuildGiftCard")',
        dataType: 'json',
        success: function (result) {
            $("#savedText").html(result);
        },
        contentType: 'application/json; charset=utf-8',
        data: JSON.stringify(obj)
    });

    return false;
}

public JsonResult TestingFunction(PurchaseModel model)
{
    return Json("Billing information saved successfully.");
}