对象引用未设置为对象的实例。（ASP.NET MVC错误）

Question

我编写ASP.NET MVC应用程序

我有模特

 public class MailModel
{
    public string From { get; set; }
    public string To { get; set; }
    public string Subject { get; set; }
    public string Body { get; set; }
    public string Link { get; set; }
    [DataType(DataType.Date)]
    [DisplayFormat(DataFormatString = "{0:lol}", ApplyFormatInEditMode = true)]
    public DateTime LinkStartTime { get; set; }
    [DataType(DataType.Date)]
    [DisplayFormat(DataFormatString = "{0:lol}", ApplyFormatInEditMode = true)]
    public DateTime LinkEndTime { get; set; }


}

控制器

  public ActionResult EmailInvitation()
    {
        return View();
    }
    [HttpPost]
    public ViewResult EmailInvitation(SmartSolutions.Models.MailModel _objModelMail)
    {
        if (ModelState.IsValid)
        {
            var emailList = db.Clients.Select(u => u.Email).ToList();
            var emails = String.Join(",",emailList);
            MailMessage mail = new MailMessage();
            mail.To.Add(emails);
            mail.From = new MailAddress(_objModelMail.From = "suhomlin.eugene93@gmail.com");
            mail.Subject = _objModelMail.Subject="Видео интервью";
            string Body = _objModelMail.Body = "Предлагаем пройти интервью";
            mail.Body = Body;
            mail.IsBodyHtml = true;
            SmtpClient smtp = new SmtpClient();
            smtp.Host = "smtp.gmail.com";
            smtp.Port = 587;
            smtp.UseDefaultCredentials = false;
            smtp.Credentials = new System.Net.NetworkCredential
            ("**********", "***********");// Enter seders User name and password
            smtp.EnableSsl = true;
            smtp.Send(mail);
            return View("EmailInvitation", _objModelMail as IEnumerable<MailModel>);
        }
        else
        {
            return View();
        }

并查看

 @model  IEnumerable<SmartSolutions.Models.MailModel>
@{
    Layout = "~/Views/Shared/_Layout5.cshtml";
}
@{
    ViewBag.Title = "Индивидуальное приглашение";
}

<div class="inner-div3">
    <div class="right-welcome-div2">
        <table class="table">
            <tr style="background: #d1d3d4">
                <th></th>
            <th style="font-size: 20px; text-align: center;">
                @Html.DisplayNameFor(model => model.To)
            </th>
                </tr>
                @foreach (var item in Model)
                {
                <tr>
                    <td style="text-align: center; font-size: 18px;">
                        @Html.DisplayFor(modelItem => item.To)
                    </td>
           </tr>
              }
</table>
</div>

当我尝试启动视图时出现此错误

我不知道这个错误，也许有人可以帮助我吗？

我觉得模特一切都好。

非常感谢你的帮助。