private byte[] ObjectToByteArray(object obj)
{
  // proper way to serialize object
  var objToString = System.Text.Json.JsonSerializer.Serialize(obj);
  // convert that that to string with ascii you can chose what ever encoding want
  return System.Text.Encoding.ASCII.GetBytes(objToString);
}

private object ByteArrayToObject(byte[] bytes)
{
  // make sure you use same type what you use chose during conversation
  var stringObj = System.Text.Encoding.ASCII.GetString(bytes);
  // proper way to Deserialize object
  return System.Text.Json.JsonSerializer.Deserialize