问JQuery Ajax在ASP.NET MVC中发送电子邮件后不返回警报

EN

[HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<ActionResult> Contact(int id, String FromName, String FromEmail, String Message, String subject)
    {
        //To select email of student in current project
        var studentEmail = (from ss in db.Users
                            where ss.projectGroup == id
                            select ss.userEmail).ToArray();
        var isSuccess = false;
        var message = "";
        using (var smtp = new SmtpClient())
        {

            for (int h = 0; h < studentEmail.Length; h++)
            {
                try
                {
                    var body = "<p>Email From: {0} ({1})</p><p>Message:</p><p>{2}</p>";
                    var smtpClient = new SmtpClient();
                    var msg = new MailMessage();

                    msg.To.Add(new MailAddress(studentEmail[h])); //replace with valid value

                    msg.Subject = subject;
                    msg.Body = string.Format(body, FromName, FromEmail, Message);
                    msg.IsBodyHtml = true;

                    smtp.Send(msg);
                    isSuccess = true;
                    message = "The data has been processed!";
                }
                catch (Exception ex)
                {
                    message = "Something failed";
                }
            }
        }
        var jsonData = new { isSuccess, message };

        return Json(jsonData);
       }

<script type="text/javascript">
function formSuccess(data) {
    if (data.isSuccess) {
        alert("your email has been successfully sent to all students in this project " + data.message);
    } else {
        alert("Sending failed " + data.message);
    }
}

@using (Ajax.BeginForm("Contact", "AreaOfInterest", new { id = pID }, new AjaxOptions { HttpMethod = "POST", OnSuccess = "formSuccess" }))
    {
        @Html.AntiForgeryToken()
        @Html.Raw(TempData["msg"])
        <div class="panel panel-default">
            <div class="panel-heading">
                <h4 class="panel-title">
                    <a class="collapsed" data-toggle="collapse" data-parent="#accordion" href="#collapseThree">
                        <strong> Contact with students </strong>
                    </a>
                </h4>
            </div>
            <div id="collapseThree" class="panel-collapse collapse">
                <div class="panel-body">
                    <form>
                        <div class="form-group">
                            <label class="sr-only" for="contact-name">Name</label>
                            <input type="text" name="FromName" placeholder="your name..." class="contact-name form-control" id="contact-name" required>
                        </div>
                        <div class="form-group">
                            <label class="sr-only" for="contact-email">Email</label>
                            <input type="text" name="FromEmail" placeholder="your email..." class="contact-email form-control" id="contact-email" required>
                        </div>
                        <div class="form-group">
                            <label class="sr-only" for="contact-subject">Subject</label>
                            <input type="text" name="subject" placeholder="Subject..." class="contact-subject form-control" id="contact-subject" required>
                        </div>
                        <div class="form-group">
                            <label class="sr-only" for="contact-message">Message</label>
                            <textarea name="Message" placeholder="Message..." class="contact-message form-control" id="contact-message" required></textarea>
                        </div>

                        <input type="submit" class="btn btn-default" value="Send" />

                    </form>


                </div>
            </div>
        </div> <!-- .panel -->
    }