public IActionResult Add(IFormCollection collection)
{
if (_newsLetterRepository.CheckIfDataIsOk(collection["email"]))
{
_newsLetterRepository.AddToNewsLetter(collection["email"]);
ViewBag.Status = "OK";
}
else
{
ViewBag.Status = "incorrect";
}
ViewBag.Email = collection["email"];
return(View());
}