C#

https://docs.microsoft.com/en-us/dotnet/csharp/

Read, Modify, Write XML

// read from file
XmlDocument xml = new XmlDocument();
xml.Load("input.xml");

// Make changes to the document.
XmlNode node = xml.DocumentElement.SelectSingleNode("/settings");
...

// write to file
using(XmlTextWriter xtw = new XmlTextWriter("output.xml", Encoding.UTF8)) {
    xtw.Formatting = Formatting.Indented; // optional, if you want it to look nice
    xml.WriteContentTo(xtw);
}

Reference:

• Best way to read, modify, and write XML