string ApplicationDataFolder
        {
            get
            {
                return Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
                        Assembly.GetExecutingAssembly().GetName().Name);
            }
        }
        string UserSettingFilePath
        {
            get
            {
                return Path.Combine(ApplicationDataFolder, "Setting.xml");
            }
        }
 [Serializable]
    public class AppSetting
    {
        public AppSetting()
        {
           //default instantiation
        }

        public int? CurrentUserId
        {
            get;
            set;
        }


    }
    enter code he