How do I stop datagridview in winforms automatically generating columns at design time when there is a bindingnavigator?

Question

I am trying to write a header-detail form. in VS2010 C# Winforms. The form binds to an Entity Framework class with an property called Attendees using a BindingSource control called bindingSource1. The grid is bound to another BindingSource control with datasource = bindingSource1 and DataMember = Attendees

I am using code first EF. The entity class is

public class ContactEvent
{
    public int Id { get; set; }
    public string Title { get; set; }

    private readonly BindingList<ContactEventAttendee> _attendees = new BindingList<ContactEventAttendee>();
    public virtual BindingList<ContactEventAttendee> Attendees
    {
        get { return _attendees; }
    }
}

I set the columns using the designer, deleting all the columns I don't want. As soon as I save the form and re-open it the columns I dont want are back

I have looked here and tried the technique - but it doesn't help. Anyway - my problem shows at design time.

The problem only occurs if I delete all the bound columns. Since all my columns are unbound this is what I want.

The ContactEventAttendee class is as follows;

public class ContactEventAttendee : ILoggedEntity
{
    public int Id { get; set; }
    public Guid RowId { get; set; }
      [ConcurrencyCheck]
    public int RowVersionId { get; set; }
    public int SourceSiteNumber { get; set; }
    public virtual ContactEvent ContactEvent { get; set; }
    public virtual Person Person { get; set; }
}

I get the same problem with another related class as well. The problem disappears if I delete the bindingNavigator from the form

The data source is

Answer 1

give it a try.

public class ContactEvent
{
    public int Id { get; set; }
    public string Title { get; set; }

    public virtual ICollection<ContactEventAttendee> ContactEventAttendees {get; set;}
}

EDIT

okay, i am having with exact problem when i tried to create a project and set the DataSource with your Class to DataGridView and this another strange bug? well, we really don't know but here my solution.

1. Seperate your EntityCodeFirst in another Class Project and rebuild this every you made changes.
2. In your main project just add to Reference see image below:
3. Now choose the DataSource in your DataGridView with the Object

Now, try to delete all the columns and rebuild it again.

EDIT: Reference of my sample

public class ContactEvent
{
    public int Id { get; set; }
    public string Title { get; set; }
    public  ICollection<ContactEventAttendee> _attendees  { get; set;}
}

public class ContactEventAttendee
{
    public int Id { get; set; }
    public Guid RowId { get; set; }
    public int RowVersionId { get; set; }
    public int SourceSiteNumber { get; set; }
    public virtual ContactEvent ContactEvent { get; set; }
}