public abstract void RemoveDivision(Division division);
public abstract void AddDivision(Division division);
public override void AddDivision(Division division) { try { Departments.Add(division); } catch { } }
public override void RemoveDivision(Division division) { try { Departments.Remove(division); } catch { } }
public void AddDivision(Division division) { Divisions.Add(division); }