private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e) { FormSettings frms = new FormSettings(); frms.SetSettings(this); List <FormSettings> settings = new List <FormSettings>(); settings.Add(frms); string json = JsonConvert.SerializeObject(settings.ToArray()); File.WriteAllText(Environment.CurrentDirectory + "\\formsettings.json", json); }