Flawed (?) sync methods

gistfile1.txt

void SyncToSignalR<T>(ObservableCollection<T> oc)
{
    oc.OnCollectionChanged += (o, e) { Hub.Send(e.NewItems.Cast<T>()); }
    //race condition, what if OnCollectionChanged fires before send is donev
    Hub.Send(oc)); 

}
//alternatiive
void SyncToSignalR2<T>(ObservableCollection<T> oc)
{

    Hub.Send(oc)); //sync current content of collection
    //race condition, what if OnCollectionChanged fires before event handler is hooked up
    oc.OnCollectionChanged += (o, e) { Hub.Send(e.NewItems.Cast<T>()); } 

}