public ActionResult Edit(NewsletterParticipant newsletterparticipant)
 {
     if (ModelState.IsValid)
     {
         db.Entry(newsletterparticipant).State = EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     return View(newsletterparticipant);
 }
 public ActionResult Create(string newsletterparticipant)
 {
     var np = new NewsletterParticipant
     {
         NewsletterParticipantEmail = newsletterparticipant
     };
    
         db.NewsletterParticipants.Add(np);
         db.SaveChanges();
         return View();
    
 }