partial void DeleteMissedConversationItem(MissedConversationItem instance);
 partial void InsertMissedConversationItem(MissedConversationItem instance);
 partial void UpdateMissedConversationItem(MissedConversationItem instance);
 private void detach_MissedConversationItems(MissedConversationItem entity)
 {
     this.SendPropertyChanging();
     entity.ConversationItem = null;
 }