public void SerializeObject<T>(string filename, T obj)
        {
            Stream stream = File.Open(filename, FileMode.Create);
            BinaryFormatter binaryFormatter = new BinaryFormatter();
            binaryFormatter.Serialize(stream, obj);
            stream.Close();
        }

        public T DeSerializeObject<T>(string filename)
        {
            T objectToBeDeSerialized;
            Stream stream = File.Open(filename, FileMode.Open);
            BinaryFormatter binaryFormatter = new BinaryFormatter();
            objectToBeDeSerialized = (T)binaryFormatter.Deserialize(stream);
            stream.Close();
            return objectToBeDeSerialized;
        }