How to load XML and read and write V3.8

I work on Android and would like to work with an XML file
Monogamous V3.8
Do you have an example?
I tried several methods

  • Creation xml in a folder
    -Xml creation with MGCB
    -Add the class reference
    -The MGCB complication only works in COPY mode
    -IntermediateSerializer does not work on version 3.8

How can I read and write the data?
Can you give me a lead or maybe you have an example that addresses my problem?

MyXml namespace
public class XmlTest
string Name;
int Val;

<? xml version = "1.0" encoding = "utf-8"?> Test 100

Your help is very precious
Thanks in advance.