Data exchange via TCP. Ensure that the message is complete.

I have a question—answer interface to implement. If the message is large, it may be split into several parts. What options are available for receiving complete messages?

Request

<ROOT>
  <REQUESTS>
    <VARIANT name="Receiver">
      <PROGRAM name="824842" />
    </VARIANT>
    <VARIANT name="Color">
      <PROGRAM name="9d9.88" />
      <PROGRAM name="9s9.88" />
    </VARIANT>
  </REQUESTS>
</ROOT>

Response

<ROOT>
  <RESPONSE>
    <CURRENT name="Receiver">
      <PRODUCT name="MusicDAB_99" />
    </CURRENT>
   </RESPONSE>
</ROOT>

if (data.Length > 0)
 {
     string receivedMessage = messageBuilder.ToString().TrimEnd();

     // Raise the MessageReceived event
     OnMessageReceived($"{client.Client.RemoteEndPoint}: {receivedMessage}");

     receivedMessage = "From  24.10.2025, " + receivedMessage;
     byte[] response = Encoding.ASCII.GetBytes(receivedMessage.ToUpper() + Environment.NewLine);
     await stream.WriteAsync(response, 0, response.Length);

     messageBuilder.Clear();
 }