Coroutine iterator question

   How do I prevent my code from returning until the object created in it is full instaniated and a valid object?

//Coroutine Iterator

public IEnumerable<INotifyCompleted> CreateJobHistory(Member member){

   var localInfoOp = Manager.LocalInfos.ExecuteAsync();

    yield return localInfoOp;

//Get first LocalInfo.NextJobHistRef and increment by 1

    LocalInfo localInfos = localInfoOp.Results.First<LocalInfo>();

    int nextRefNo = localInfos.NextJobHistRef;

localInfos.NextJobHistRef = nextRefNo + 1;
List<Entity> changedEntities = new List<Entity>();

changedEntities.Add(localInfos);
var saveOp = Manager.SaveChangesAsync(changedEntities);

saveOp.Completed += (sender, args) =>{
if (args.CompletedSuccessfully)

{
}
else

{
}
};
// ////Create a new JobHistory

JobHistory newJob = new JobHistory

{
SocSecNo = member.SocSecNo,
RefNo = nextRefNo,
Member = member
};
yield return Coroutine.Return(newJob);

}