entity framework 5 - C# .NET 4.5 and EF 5 update navigation property (foreign key) -

i can't update navigation property have 2 entities: user

public class user : entity {     public string username { get; set; }     public string password { get; set; }      public int? addressid { get; set; }     public virtual address address { get; set; } } 

and address

public class address : entity {     public string addressname { get; set; }      public int userid { get; set; }     public virtual user user { get; set; }  } 

when trying following:

address.user = user; 

address userid updates succesfully, , in commit method, entity state modified. users addressid won't update.

here context

public dbset<user> users { get; set; } public dbset<address>  addresses { get; set; }  protected override void onmodelcreating(dbmodelbuilder modelbuilder) {     modelbuilder.entity<user>()                     .hasoptional(x=>x.address)                     .withmany()                     .hasforeignkey(x=>x.addressid)                     .willcascadeondelete(false);     base.onmodelcreating(modelbuilder); } 

and using unity framework , genereic repository pattern. tried set properties virtual no effect.

i think there conception problem here, beyond foreign key problem. why refer addressid if have address object in user class ? it's same thing address class. maybe should try :

public class user : entity {     public string username { get; set; }     public string password { get; set; }      public virtual address address { get; set; } }  public class address : entity {     public string addressname { get; set; }      public virtual user user { get; set; } } 

but make clear, entity framework not magic wizard (clause to...). architecture, have manually update both foreign keys (if want keep addressid , userid properties).