public Books UpdateBook(Books newBook, Books oldBook)
 {
     context.Entry(oldBook).CurrentValues.SetValues(newBook);
     context.SaveChanges();
     return(newBook);
 }
 public Authors UpdateAuthors(Authors newAuthor, Authors oldAuthors)
 {
     context.Entry(oldAuthors).CurrentValues.SetValues(newAuthor);
     context.SaveChanges();
     return(newAuthor);
 }