public ActionResult TakeConfirmed(int id)
{
IEnumerable <User> Users = dataOperations.GetUsersTakenBook(id);
foreach (User user in Users)
{
if (user.Us_name == User.Identity.Name)
{
ModelState.AddModelError("Book_name", "You have already taken this book!");
return(View(dataOperations.Find(id)));
}
}
dataOperations.ChangeQuantity(id);
dataOperations.AddTakenBook(id, User.Identity.Name, DateTime.Today);
EmailClass mail = new EmailClass();
Book book = dataOperations.Find(id);
mail.SendMessage(User.Identity.Name, book.Book_name);
return(RedirectToAction("Index"));
}