asp.net mvc 3 - Entity framework is making the id null on insert -

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i'm getting following error when try insert new row in 1 of relational tables. have following 2 models: 

public class companycredit {     [key]     [databasegenerated(databasegeneratedoption.identity)]     public int creditid { get; set; }      public int plancredit { get; set; }     public datetime? plancreditexpirationdate { get; set; }  }

and

public class companyinformation {      [key]     [databasegeneratedattribute(databasegeneratedoption.identity)]     public int id { get; set; }      [required]     [displayname("company name:")]     public string companyname { get; set; }      public string timezone { get; set; }      //navigation properties            public virtual companycredit credits { get; set; } }

and relation in dbcontext

modelbuilder.entity<companyinformation>().hasoptional(e => e.credits);

i'm trying add record inside companycredit table so:

if (_company.credits == null) {    var _credits = new companycredit();    _credits.plancredit = 200;    _credits.plancreditexpirationdate = system.datetime.utcnow.addmonths(1);     _company.credits = _credits;    repo.insertorupdate(_company, user.identity.name);  }

and insert or update marks company changed , _credit added so:

 _db.entry(_credits).state = system.data.entitystate.added;  _db.entry(company).state = system.data.entitystate.modified;  _db.savechanges();

when runs following error can't seem find reason to.

 cannot insert value null column 'creditid', table 'project.dbo.companycredits'; column not allow nulls. insert fails.

the statement has been terminated.

thank in advanced help.

i found problem in attribute [databasegenerated(databasegeneratedoption.identity)] should have been [databasegeneratedattribute(databasegeneratedoption.identity)] thought post others might benefit it.


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