MVC3 Multiple Foreign Key Values - asp.net

Question

I have two simple model classes.
Service
Attendee
Each service can be attended by 1 or more people. I want Create and Edit views based on service where all attendees display as a check box and when any of the selected/unselected it should add or remove from the corresponding service in the database.
I have been trying to build it for more than a week now but no success!
any help will be highly appreciated.
My code is as follows for these classes.
public class Service
{
public int ServiceID { get; set; }
public string Problem { get; set; }
public virtual ICollection<Attendie> AttendedBy { get; set; }
}
public class Attendie
{
public int AttendieID { get; set; }
public string Name { get; set; }
public virtual Service Service { get; set; }
}
public class ServiceAttendiesDBContext: DbContext
{
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
}
public DbSet<Service> Services { get; set; }
public DbSet<Attendie> Attendies { get; set; }
}
public class ServiceAttendiesInitializer : DropCreateDatabaseAlways<ServiceAttendiesDBContext>
{
protected override void Seed(ServiceAttendiesDBContext context)
{
base.Seed(context);
var attendies = new List<Attendie>
{
new Attendie{AttendieID=1,Name="Attendie1"},
new Attendie{AttendieID=2,Name="Attendie2"},
new Attendie{AttendieID=3,Name="Attendie3"}
};
attendies.ForEach(at => context.Attendies.Add(at));
context.SaveChanges();
var services = new List<Service>
{
new Service{ ServiceID=1,Problem="Problem1",AttendedBy=new List<Attendie>()},
new Service{ ServiceID=2,Problem="Problem2",AttendedBy=new List<Attendie>()},
new Service{ ServiceID=3,Problem="Problem3",AttendedBy=new List<Attendie>()}
};
services.ForEach(ser => context.Services.Add(ser));
context.SaveChanges();
services[0].AttendedBy.Add(attendies[0]);
services[0].AttendedBy.Add(attendies[1]);
services[1].AttendedBy.Add(attendies[2]);
services[1].AttendedBy.Add(attendies[2]);
services[2].AttendedBy.Add(attendies[1]);
context.SaveChanges();
}