Some overview of Entity Framework implementation

1.         private agsEntities agsEntities = new agsEntities(connectionstring);
2.  
3.         public ObservableCollection<FAMILY> FamilyCollection.....
4.         ..........INotify
5.  
6.  
7.         public ObjectQuery<FAMILY> FamiliesQuery;
8. // FAMILY class is defined as:      public partial class FAMILY : EntityObject
9. // mostly this was autocreated by EF
10.         public ObjectQuery<FAMILY> GetFAMILIESQuery(agsEntities agsEntities)
11.         {
12.             ObjectQuery<FAMILY> fAMILIESQuery = agsEntities.FAMILIES;
13.             return fAMILIESQuery;
14.         }
15.  
16.         private CollectionViewSource _familiesViewSource;
17.         public CollectionViewSource FamiliesViewSource
18.         {
19.             get
20.             {
21.                 if (_familiesViewSource == null)
22.                     GetFamilyViewSource();
23.                 return _familiesViewSource;
24.             }
25.         }
26.  
27.         private void GetFamilyViewSource()
28.         {
29.             // Load data into FAMILIES
30. //this is ObjectQuery<T>
31.             this.FamiliesQuery = this.GetFAMILIESQuery(this.agsEntities);
32. //this is a CollectionViewSource......
33.             this._familiesViewSource = new CollectionViewSource();
34. //this is an ObjectResult<T>
35.             this._familiesViewSource.Source = this.FamiliesQuery.Execute(MergeOption.AppendOnly);
36. //refresh the view (in this case a DataGrid is bound to FamiliesViewSource
37.             this._familiesViewSource.View.Refresh();
38. //and into an observable collection just in case
39. //agsEntities.FAMILIES is defined by EF as:       public ObjectSet<FAMILY> FAMILIES
40.             foreach (FAMILY thing in agsEntities.FAMILIES)
41.                 FamilyCollection.Add(thing);
42.  
43.         }