I've added a column 'IsDeleted' to each entity during my Entity Framework 4. model and implemented an Interface for this. How do i accomplish this the organizations with 'IsDeleted' set to 'true' are overlooked by all Objectsets and Navigationproperties during my model? Blocking the end result using LinQ doesn't work i believe, since the result cannot be changed back to an ObjectSet.

Can anybody assist me to please?

BTW: My template creates ObjectSets within the context-class such as this:

Private _Persons As ObjectSet(Of Person)
Public ReadOnly Property Persons() As ObjectSet(Of Person)
    Get
        If (_Persons Is Nothing) Then
            _Persons = MyBase.CreateObjectSet(Of Person)("Persons")
        End If
        Return _Persons
    End Get
End Property

and navigation qualities for that organizations like that one:

<XmlIgnoreAttribute()>
<SoapIgnoreAttribute()>
<DataMemberAttribute()>
<EdmRelationshipNavigationPropertyAttribute("Model", "Map_Persons_Organisations", "Persons")>
 Public Property Persons() As EntityCollection(Of Person)
    Get
        Return CType(Me,IEntityWithRelationships).RelationshipManager.GetRelatedCollection(Of Person)("Model.Map_Persons_Organisations", "Persons")
    End Get
    Set
        If (Not value Is Nothing)
            CType(Me, IEntityWithRelationships).RelationshipManager.InitializeRelatedCollection(Of Person)("Model.Map_Persons_Organisations", "Persons", value)
        End If
    End Set
End Property

What's the reason for your IsDeleted flag? Objects marked for deletion get their status up-to-date through the ObjectStateManager. You are able to determine whether an item continues to be marked for deletion before SaveChanges() continues to be known as by querying the ObjectStateManager.

If you wish to exclude erased organizations out of your queries, call SaveChanges() marking them for deletion.. You may also use AcceptChanges() to get rid of organizations in the collection without carrying out the deletion towards the database.