private void RemoveUnnecessaryTabpagesAcceptFour(ref TabPage tp1, ref TabPage tp2, ref TabPage tp3, ref TabPage tp4) { try { foreach (TabPage tp in tcOperation.TabPages) { if (!IsTwoStringEqual(tp.ToString(), tp1.ToString()) && !IsTwoStringEqual(tp.ToString(), tp2.ToString()) && !IsTwoStringEqual(tp.ToString(), tp3.ToString()) && !IsTwoStringEqual(tp.ToString(), tp4.ToString())) { tcOperation.TabPages.Remove(tp); } } } catch { throw; } }