Suggestion about changed to state management

interface IByteStateConverter
{
	IIdentifiable ConvertFromByteArray(byte[] array);
	byte[] ConvertToByteArray(IIdentifiable stateId);
}

public interface IManageState
{
	/// <summary>
	/// Store the linkable component's current State
	/// </summary>
	/// <returns>Object that identifies the stored state.</returns>
	IIdentifiable KeepCurrentState();

	/// <summary>
	/// Restores the state identified by the parameter stateID. If the state identifier identified by
	/// stateID is not known by the linkable component an InvalidOperationException should be trown.
	/// </summary>
	/// <param name="stateID">Object that identifies the state to be restored.</param>
	void RestoreState(IIdentifiable stateId);

	/// <summary>
	/// Clears a state from the linkable component's memory. If the state identifier identified by
	/// stateID is not known by the linkable component an exception should be trown.
	/// </summary>
	/// <param name="stateID">Object that identifies the state to be cleared.</param>
	void ClearState(IIdentifiable stateId);
}

public interface IByteStateConverter {
	IIdentifiable convertFromByteArray(byte[] array);
	byte[] convertToByteArray(IIdentifiable stateId);
}

public interface IManageState {
	public IIdentifiable keepCurrentState();
	public void restoreState(IState state);
	public void clearState(IState state);
}

	public interface IManageState
	{
		/// <summary>
		/// Store the linkable component's current State
		/// </summary>
		/// <returns>Object that identifies the stored state.</returns>
		Object KeepCurrentState();

		/// <summary>
		/// Restores the state identified by the parameter stateID. If the state identifier identified by
		/// stateID is not known by the linkable component an exception should be trown.
		/// </summary>
		/// <param name="stateID">Object that identifies the state to be restored.</param>
		void RestoreState(Object stateID);

		/// <summary>
		/// Clears a state from the linkable component's memory. If the state identifier identified by
		/// stateID is not known by the linkable component an exception should be trown.
		/// </summary>
		/// <param name="stateID">Object that identifies the state to be cleared.</param>
		void ClearState(Object stateID);
	}

	interface IPersistentState
	{
		/// <summary>
		/// Transform the state of a component instance into an array of bytes
		/// </summary>
		/// <param name="state">The state to be turned into a byte array</param>
		/// <returns></returns>
		byte[] makePersistent(object state);

		/// <summary>
		/// Read the state of a component instance from an array of bytes
		/// </summary>
		/// <param name="persistentState">Byte array containing the state</param>
		/// <returns></returns>
		object readPersistentState(byte[] persistentState);
	}