C#/XML: 'System.Xml.XmlDocument' does not contain a definition for 'Descendants'

Question

I just received an error a while ago from this code:

private void ShowXMLDatatoRTB() {
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load("XMLFile.xml");

var persons = from person in xmlDoc.Descendants("Person")
        select new
            {
                Name = person.Element("Name").Value,
                    City = person.Element("City").Value,
                Age = person.Element("Age").Value,
            };

richTextBox1.Text = "";
foreach (var person in persons)
{
    richTextBox1.Text = richTextBox1.Text + "Name: " + person.Name + "\n";
            richTextBox1.Text = richTextBox1.Text + "City: " + person.City + "\n";
            richTextBox1.Text = richTextBox1.Text + "Age: " + person.Age + "\n\n";
    }

if (richTextBox1.Text == "")
            richTextBox1.Text = "No Results."; }

Am I missing something?

Answer 1

You just need to switch from XmlDocument to XDocument.

Answer 2

You are trying to use LINQ to SQL but actually using the old school DOM API. You need to add references to System.XML and System.Xml.Linq and use XDocument, not XmlDocument.