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using System;
using System.IO;
using System.Security.Permissions;
using System.Drawing;
using System.Windows.Forms;
using System.Xml;
using System.DirectoryServices;
using System.DirectoryServices.ActiveDirectory;
using System.Threading;



namespace Terminarbeiten
{

  public partial class quickmsg : Form
  {


    public quickmsg()
    {
      
      InitializeComponent();
      
            

      ListViewGroup on=new ListViewGroup();
      on.Name="ON";on.Header="Online";
      listView1.Groups.Add(on);
      ListViewGroup off=new ListViewGroup();
      off.Name="off";off.Header="Offline";
      listView1.Groups.Add(off);
      
      
      lv_refresh();
      
      FileSystemWatcher fs = new FileSystemWatcher();
      fs.Path=mainfrm.exepfad;
      fs.Filter="server.xml";
      fs.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.DirectoryName;
          fs.Changed += new FileSystemEventHandler(OnChanged);
      fs.EnableRaisingEvents = true;
      
      
    }
    

    void lv_refresh()
    {  
      
      listView1.BeginUpdate();
      
      XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.Load("server.xml");
         XmlElement elmRoot = xmlDoc.DocumentElement;
         listView1.Items.Clear();//Bein zweiten durchlauf killt er sich hier!
           int userint;
           foreach (XmlNode element in elmRoot) 
           {userint+=1;
           string lan=element.ChildNodes[0].InnerText;
           int onoff= Convert.ToInt32(element.ChildNodes[3].InnerText);
           
           ListViewItem itm = new ListViewItem();
           itm.Group= listView1.Groups[onoff];
           itm.Text=userint.ToString();
           listView1.Items.Add(itm);
           
        }
         listView1.EndUpdate();
         
    }  
    
    
    void OnChanged(object sender, FileSystemEventArgs e)
    {
      
      lv_refresh();
      
    }
    

    
}
}                    

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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE srv[
<!ATTLIST server id ID #IMPLIED>
]>
<root>
  <server7>
    <name>User1</name>
    <port>10000</port>
    <ip>10.0.0.127</ip>
    <onoff>0</onoff>
  </server7>
  <server4>
    <name>User2</name>
    <port>10000</port>
    <ip>10.0.0.128</ip>
    <onoff>1</onoff>
  </server4>
</root>                    

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fs.SynchronizingObject=this;                    

1:

Thread.Sleep(500);