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public class LogSettings
{
   public string File { get; set; }
   public string Level { get; set; }
}					

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// objekt anlegen
LogSettings logSettings = new LogSettings();
logSettings.File = "logs/Application.log";
logSettings.Level = "Debug"
// serializer initialisieren
XmlSerializer serializer = new XmlSerializer(typeof(LogSettings));
// objekt speichern
using(Stream s = File.OpenWrite("settings.ini"))
{
serializer.Serialize(logSettings, s);
}
// objekt laden
using(Stream s = File.OpenRead("settings.ini"))
{
   LogSettings geladeneSettings = (LogSettings) serializer.Deserialize(s);
   Console.WriteLine("LogFile: " + geladeneSettings.File);
}					

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myTextBox.Text = File.ReadAllText(filename);
// bzw.
File.WriteAllText(filename, myTextBox.Text);