using System;

using System.Linq;

using System.Xml.Linq;

public class Program

{

    public static void Main()

    {

        var xml = @"<?xml version=""1.0"" encoding=""UTF-8""?>

                                                <kml xmlns=""http://www.opengis.net/kml/2.2"">

                                                  <Document>

                                                                <name>Trip List Report</name>

                                                                <description>Trip List Data Export (GPX/KML) for All Projects - 402 - WINCH - All Trip Types. (01/08/2020 to 31/08/2020)</description>

                                                    </Document></kml>";

​

        XElement root = XElement.Parse(xml);

        var element = root.Descendants().FirstOrDefault(n => n.Name.LocalName == "description");

        Console.WriteLine(element.Value);

​

    }

}