show data from another model in view - asp.net

Question

I have this model `
public int Id { get; set; }
public string Title { get; set; }
public int CopiesNum { get; set; }
public int CurrentCopiesNum { get; set; )
public Author author { get; set; }
public int AuthorId { get; set; }
i want throug this action to show up the name of author which i made it to search `
public ActionResult SearchForBook(string BookName)
{
var book1 = from s in db.Books
select s;
if (!string.IsNullOrEmpty(BookName))
{
book1 = book1.Where(c => c.Title.Contains(BookName));
}
ViewBag.AuthorId = new SelectList(db.Authors, "AuthorId", "Name").ToList();
// var book = db.Books.Include(b => b.author).ToList();
return View(book1);
}
when i try to show the name of author
<td>
#Html.DisplayFor(modelItem => item.author.Name)
</td>
it shows nothing

Answer 1

As you are using Eager loading, you need to include Author. Try something like this:
In your Controller-
var book1 = db.Books.Include(a => a.Author).ToList();
If you want to use lazy loading then in the model
public virtual Author author { get; set; }
Then your controller should work.
Modification
As you said about your requirement in the comment section, this can also be achieved like below:
In you Controller:
var book1 = new Book();
if (!string.IsNullOrEmpty(BookName))
{
book1 = _context.Books.Include(c => c.Author).SingleOrDefault(c => c.Title == "BookName");
}
You can simply send book1 to the view (You should check if book1 contains anything and if not then handle it properly).
And if you really don't want to change the way you coded, you can edit the Controller like below:
var book1 = from s in _context.Books.Include(c => c.Author)
select s;
And keep the rest of the code as it is. It should also work (though I do not recommend this.)