namespace Efx41
{
    using System;
    using System.Collections.Generic;
 
    public partial class Customer
    {
        public Customer()
        {
            this.Projects = new HashSet<Project>();
        }
 
        public int ID { get; set; }
        public string CustomerName { get; set; }
 
        public virtual ICollection<Project> Projects { get; set; }
    }
}

using (EfxTestSchemaEntities ctx = new EfxTestSchemaEntities())
{
	//ProxyCreation aussschalten
	((IObjectContextAdapter)ctx).ObjectContext.
		ContextOptions.ProxyCreationEnabled = false;
	var customer = ctx.Customers.First();
 
	var projects = customer.Projects;
 
	SrcProjects.DataSource = projects;
	Debug.WriteLine("Projects Type Name: " + projects.GetType().FullName);
	Debug.WriteLine("Projects is IListSource: " + (projects is _
  IListSource).ToString());
	Debug.WriteLine("BindingSrc List Type: " + SrcProjects.List.GetType( _
).FullName);
}

Projects Type Name: System.Collections.Generic.HashSet`1[[Efx41.Project, Efx41, _
  Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]
Projects is IListSource: False
BindingSrc List Type: _
  System.ComponentModel.BindingList`1[[System.Collections.Generic.HashSet`1[[Ef_
  x41.Project, Efx41, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], _
  System.Core, Version=4.0.0.0, Culture=neutral, _
  PublicKeyToken=b77a5c561934e089]]