Populating a dropdownlist with values - asp.net-mvc-3

Question

Hello I'm trying to make my dropdownlist to work but it seems harder than expected. I have 3 domain classes Member, Rental and Movie. My Idea was to make a dropdownlist that will show a specific users rented movies and when I select a movie in the dropdownlist and submit it I will get back the selected movie and I can set bool IsInStock to true.
So I made a viewmodel and a controller action but would like some help how to go forward with this. Now I get a dropdownlist with the users "Jan" rented movies but when I klick submit I would like to get the values back in order to set the IsInStock to true. I know I will need method to handle the POST values but I'm trying to make this work first.
public class Member
{
public virtual int MemberId { get; set; }
public virtual string LastName { get; set; }
public virtual List<Rental> Rentals { get; set; }
}
public class Rental
{
public virtual int RentalId { get; set; }
public virtual int MovieId { get; set; }
public virtual Movie Movie { get; set; }
public virtual int MemberId { get; set; }
public virtual Member Member { get; set; }
}
public class Movie
{
public virtual int MovieId { get; set; }
public virtual string Name { get; set; }
public virtual bool IsInStock { get; set; }
}
public class RentalsViewModel
{
// Need something here.
public IEnumerable<SelectListItem> RentedMovies { get; set; }
}
public ActionResult ReturnMovie()
{
var rentedmovies = db.Rentals.Where(r => r.Member.Name == "Jan").ToList();
var model = new RentalsViewModel()
{
RentedMovies = rentedmovies.Select(x => new SelectListItem
{
Value = x.MovieId.ToString(),
Text = x.Movie.Name
})
};
return View(model);
}
// In the View
#using (Html.BeginForm())
{
#Html.DropDownListFor(x => x.RentedMovies, //Something here);
<p>
<input type="submit" value="Save" />
</p>
}

Answer 1

First parameter here:
#Html.DropDownListFor(x => x.RentedMovies, //Something here);
must be int, because you will send this value to the server:
public virtual int MovieId { get; set; }
So, your example could look like:
#Html.DropDownListFor(x => x.RentedMovieId, Model.RentedMovies);
(Add property RentedMovieId to RentalsViewModel)