@using SendEmail.Models @model List
   <user>

  @{ Layout = "~/Views/Shared/_Layout.cshtml"; }

  <h2>@ViewBag.ButtonText</h2>


  <script type="text/javascript" src="@Url.Content(" ~/Scripts/ ")jquery-1.10.2.js"></script>
<script type="text/javascript">
$(document).ready(function() {
  $('#checkBoxAll').click(function() {
    if ($(this).is(":checked"))
      $('.chkCheckBoxId').prop('checked', true);
    else
      $('.chkCheckBoxId').prop('checked', false);

  });
});
 </script>

 @if (ViewBag.ButtonText == "Send Reminder Email") {
@using (Html.BeginForm("SendReminder", "ControllerName", FormMethod.Post))
{
 <table>
<tr>

  <th>First Name</th>
  <th>Last Name</th>
  <th>Email</th>
  <th>
    <input type="checkbox" id="checkBoxAll" />Select All</th>

</tr>
@foreach (user u in Model) {
<tr>

  <td>@u.first_name</td>
  <td>@u.last_name</td>
  <td>@u.email</td>
  <td>
    <input type="checkbox" class="chkCheckBoxId" value="@u.email" name="userId" />

  </td>

</tr>

   }
 </table>
 }
 }
<div>
<p>
  <input type="submit" value=@ViewBag.ButtonText />
</p>
 </div>

public ActionResult SendReminder(int id)
    {
        using (DatabaseEntities dbc = new DatabaseEntities())
        {
            DbSet<user> dbs = dbc.users;
            IQueryable<user> q = from p in dbs
            where p.Booking.event_id == id
            select p;
            List<user> model = q.ToList<user>();
            ViewBag.ButtonText = "Send Reminder Email";

            return View("ViewDetails", model);

        }

    }

[HttpPost]
    public ActionResult SendReminder(string[] userId)
    {
        using (SmtpClient objSmtpClient = new SmtpClient())
        {
            for (int emailCount = 0; emailCount < userId.Length; emailCount++)
            {
                if (!string.IsNullOrEmpty(userId[emailCount]))
                {
                    using (MailMessage mail = new MailMessage("sender@gmail.com", userId[emailCount].Trim()))
                    {
                        mail.Subject = "Test Email";
                        mail.Body = "Test Body";
                        mail.IsBodyHtml = true;
                        using (SmtpClient smtp = new SmtpClient())
                        {
                            smtp.Host = "smtp.gmail.com";
                            smtp.Port = 587;
                            smtp.Credentials = new    System.Net.NetworkCredential("sender@gmail.com", "password");
                            smtp.EnableSsl = true;
                            mail.IsBodyHtml = true;
                            smtp.Send(mail);
                        }
                    }
                }
            }
        }
        return View();
    }