Entity Framework 4: Create a new Entity, save it, no errors, and no record inserted?

EDIT: Better yet, I do this with no errors and no records inserted:

var myTopLevelEntity = _DC.TopLevelEntity.Where( p => p.ID = 1).First();
var newEntity = new Entity();
newEntity.pocofield = ""; // set all primary keys and poco fields
newEntity.TopLevelEntity = myTopLevelEntity;
_DC.Entitys.Add( newEntity);

I checked SQL server's profiler. No commands other than a select happened during th开发者_高级运维at time.

(END EDIT)

I have a set of Entities to add at once, all new. They are dependent on a record in another table. I do the following:

var myTopLevelEntity = _DC.TopLevelEntity.Where( p => p.ID = 1).First();

NewEntity has a hierarchy:

newEntity.A[].pocofields
newEntity.B[].pocofields
newEntity.C[].pocofields
newEntity.C[].D[].pocofields

So, I do this

var newEntity = new Entity();
newEntity.pocofield = ""; // various poco fields, set all keys

var A = new AEntity();
A.pocofield = ""; // various poco fields, set all keys
newEntity.As.Add( A);

var B = new BEntity();
B.pocofield = ""; // various pocos, set all keys
newEntity.Bs.Add( B);

var C = new CEntity();
C.pocofield = "";  // various, set all keys
var D = new DEntity();
D.pocofield = ""; // various, set all keys
C.Ds.Add( D);
newEntity.Cs.Add( C);

newEntity.TopLevelEntitys.Add( myTopLevelEntity);
_DC.Entitys.Add( newEntity);

At this point, no errors occur (I don't have try/catch anywhere). No records show up in the database either. What am I doing incorrect?

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I think you forgot to call _DC.SaveChanges