Modify an XML Element using LINQ - 2

public static void Main()
        {
            string serializedXml = "<Root><Students><Student>1</Student><Name>Old Name</Name><Age>33</Age></Students></Root>";

            XDocument xmlDoc = XDocument.Parse(serializedXml);
            xmlDoc.Descendants("Students").Elements("Name").Single().SetValue("New Name");
            
            Console.WriteLine(xmlDoc);
            Console.Read();
        }

Output

<Root>
<Students>
<Student>1</Student>
<Name>New Name </Name>
<Age>33</Age>
</Students>
</Root>