public IActionResult Edit(Guid id, Newsletter newsletter)
{
var model = _newsletterRepository.GetNewsletters()
.FirstOrDefault(x => id == x.Id);
model.Title = newsletter.Title;
model.Desciption = newsletter.Desciption;
model.BodyText = newsletter.BodyText;
_newsletterRepository.Update(model);
_newsletterRepository.Save();
return(RedirectToAction("ViewAll", "Newsletter"));
}