serviceAssembly = Assembly.LoadFrom(path);

public static byte[] TransformMessageToBytes(NotificationMessage msg)
        {
            if (msg == null)
                throw new ArgumentNullException(nameof(msg));

            using (MemoryStream stream = new MemoryStream())
            {
                BinaryFormatter binFormatter = new BinaryFormatter();
                binFormatter.Serialize(stream, msg);
                return stream.ToArray();
            }
        }

public static NotificationMessage TransfromBytesToNotificationMessage(byte[] array, int offset, int count)
        {
            if(array == null)
                throw new ArgumentNullException(nameof(array));

            using (MemoryStream stream = new MemoryStream())
            {
                BinaryFormatter binFormatter = new BinaryFormatter();
                stream.Write(array, offset, count);
                stream.Seek(0, SeekOrigin.Begin);
                return binFormatter.Deserialize(stream) as NotificationMessage;
            }
        }

serviceDomain.DoCallBack(() =>
{
    // for example
    // create instance of NotificationMessage by using reflection
    // Invoke convertation methods
});