Edit specific Element in XDocument

by

With using System.Xml.Linq; it becomes

 var doc = XElement.Load(fileName);
 var saveGame = doc
      .Element("savegames")
      .Elements("savegame")
      .Where(e => e.Element("IdNumber").Value == "2")
      .Single();

 saveGame.Element("balance").Value = "50";

 doc.Save(fileName);

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