LINQ where clause not returning results

Question

Result set returns empty and i'm getting that error 'Enumeration yielded no results' when i use Where clause(LINQ) . What could be problem?

public class Stores
{
    [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int StoreId { get; set; }
    public string StoreName { get; set; }
    public string Address { get; set; }
    public string Telephone { get; set; }
    public int TownId { get; set; }
}

public DbSet<Stores> Store { get; set; }

var storeList = from n in db.Store
                where n.TownId == 10
                select n;