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//wenn nicht vorhanden neue anlegen
if(File.Exists(@Application.StartupPath + "/deinekonfi.xml")==false)
{
       //wenn nicht vorhanden --> Default Einstellungen erstellen
       ConfigClass newConf = new ConfigClass();
       newConf.SchwelleOben=10;
       newConf.SchwelleUnten=5;
       XmlSerializer ser = new XmlSerializer(typeof(ConfigClass));
       FileStream str = new FileStream(@Application.StartupPath + "/deinekonfi.xml", FileMode.Create);
       ser.Serialize(str, newConf);
       str.Close(); 
}
//deserialisieren
XmlSerializer deser = new XmlSerializer(typeof(ConfigClass));
StreamReader sr = new StreamReader(@Application.StartupPath + "/deinekonfi.xml");
_config = (ConfigClass)deser.Deserialize(sr);					

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{
    public class Configuration
    {
        int _warning;
        int _alert;

       public Configuration()
        {
         //   _warning = 50;
         //   _alert = 100;
        }

        public static void Serialize(string file, Configuration c)
        {
            System.Xml.Serialization.XmlSerializer xs = new System.Xml.Serialization.XmlSerializer(c.GetType());
            StreamWriter writer = File.CreateText(file);
            xs.Serialize(writer, c);
            writer.Flush();
            writer.Close();
        }
        public static Configuration Deserialize(string file)
        {
            System.Xml.Serialization.XmlSerializer xs = new System.Xml.Serialization.XmlSerializer(typeof(Configuration));
            StreamReader reader = File.OpenText(file);
            Configuration cfg = (Configuration)xs.Deserialize(reader);
            reader.Close();
            return cfg;
        }
        public int warning
        {
            get { return _warning; }
            set { _warning = value; }
        }
        public int alert
        {
            get { return _alert; }
            set { _alert = value; }
        }
    }

}					

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public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

         // Read the configuration object from a file
            Configuration cfg = Configuration.Deserialize("configuration.xml");

         // Write out the variables read from the file
         
         textBox1.Text= cfg.alert.ToString();
         textBox1.Text+=  cfg.warning.ToString();

        }
    }					

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<?xml version="1.0"?>
<Sensors>
  <ID1>
    <warning>70</warning>
    <alert>100</alert>
  </ID1>
  <ID2>
    <warning>80</warning>
    <alert>110</alert>
  </ID2>
</Sensors>					

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public Class Sensor
{
   public List<Config>{get;set;}
//deine serialize funktionen
}