MVC4 Repository Pattern I can not show Dropdown list

interface IWard
    {
        void Add(Ward w);
        void Update(Ward w);
        void Delete(Ward w);
        List<Ward> GetAll();
        Ward GetById(int id);
        void Save();
       //List<Ward> SelectListItem();
      // public IEnumerable<SelectListItem> Albums { get; set; }
    }
public class WardRepository:IWard
{
}
public class WardController : Controller
{
}