private void SaveFile()
        {
            string fileName = ChonFile(false);
            if (fileName == null) return;
            FileStream myStream = new FileStream(fileName, FileMode.Create, FileAccess.Write);
            IFormatter formatter = new BinaryFormatter();
            formatter.Serialize(myStream, list);
            myStream.Close();
            MessageBox.Show("Lưu dữ liệu hoàn tất");
        }
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