EF 4.2 Code first, how to delete many-to-many association?

I created a many-to-many relationship between two classes.

public class Member
    public Guid MemberId { get; set; }
    public string Name { get; set; }

    public virtual ICollection<Group> Groups { get; set; } 

    public Member()
        Groups = new HashSet<Group>();

public class Group
    public Guid GroupId { get; set; }
    public string Name { get; set; }

    public virtual ICollection<Member> Members { get; set; } 

    public Group()
        Members = new HashSet<Member>();

protected override void OnModelCreating(DbModelBuilder modelBuilder)
    modelBuilder.Entity<Group>().HasMany(x => x.Members).WithMany(c => c.Groups)
        .Map(y =>

This works if i test it:

var member = new Member();
member.Name = "Smith";

var group = new Group();
group.Name = "Group 1";



But how can i delete a member from a group? I tried this: var group = db.Groups.First(); db.Groups.Remove(group); db.SaveChanges();

I just keep getting "The DELETE statement conflicted with the REFERENCE constraint". So how can i tell it to first remove the association and then the entry?


See comment from RedHat regarding setting the FK in the database to cascade on delete.

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