Check for Updates

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
using System.Windows.Forms;
using System.Diagnostics;

namespace GME
{
    class CheckUpdate
    {
        public static void Updater()
        {
            string downloadUrl = "";
            Version newVersion = null;
            string aboutUpdate = "";
            string xmlUrl = "http://www.example.com/update.xml";
            XmlTextReader reader = null;
            try
            {
                reader = new XmlTextReader(xmlUrl);
                reader.MoveToContent();
                string elementName = "";
                if ((reader.NodeType == XmlNodeType.Element) && (reader.Name == "appinfo"))
                {
                    while (reader.Read())
                    {
                        if (reader.NodeType == XmlNodeType.Element)
                        {
                            elementName = reader.Name;
                        }
                        else
                        {
                            if ((reader.NodeType == XmlNodeType.Text) && (reader.HasValue))
                                switch (elementName)
                                {
                                    case "version":
                                        newVersion = new Version(reader.Value);
                                        break;
                                    case "url":
                                        downloadUrl = reader.Value;
                                        break;
                                    case "about":
                                        aboutUpdate = reader.Value;
                                        break;
                                }
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                Environment.Exit(1);
            }
            finally
            {
                if (reader != null)
                    reader.Close();
            }
            Version applicationVersion = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version;
            if (applicationVersion.CompareTo(newVersion) < 0)
            {
                string str = String.Format("New Update Found\n\nNewest version : {1} \nLog : {2} ", applicationVersion, newVersion, aboutUpdate);
                if (DialogResult.No != MessageBox.Show(str + "\n\nWould you like to download this update?", "Check for updates", MessageBoxButtons.YesNo, MessageBoxIcon.Question))
                {
                    try
                    {
                        Process.Start(downloadUrl);
                    }
                    catch { }
                    return;
                }
                else
                {
                    ;
                }
            }
            else
            {
                MessageBox.Show("No new updates found.", "Check for Updates", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
            }
        }
    }
}