public void RemoveDiscipline(Discipline discipline) { if (!this.Disciplines.Contains(discipline)) { this.Disciplines.Remove(discipline); } else { Console.WriteLine("The discipline was not found"); } }
public void AddDiscipline(Discipline discipline) { if (!this.Disciplines.Contains(discipline)) { this.Disciplines.Add(discipline); } else { Console.WriteLine("This teacher already teaches this discipline"); } }