public void EditTechnician(Technician tech, List <Service> newSkills, List <Service> oldSkills) { techCtr.Update(tech); foreach (Service i in genLogic.GetAddedItems(oldSkills, newSkills)) { techCtr.Add(i, tech); } foreach (Service i in genLogic.GetRemovedItems(oldSkills, newSkills)) { techCtr.Remove(i, tech); } }