protected virtual void licenseExpiredChange(DateTime OldDate, DateTime NewDate)
        {
            Action<LicenseExpiredDateTimeArg> handler = licenseExpiredDateTimeChange;

            if (licenseExpiredDateTimeChange != null)
            {
                LicenseExpiredDateTimeArg arg = new LicenseExpiredDateTimeArg();
                arg.NewValue = NewDate;
                arg.oldValue = OldDate;
                handler(arg);
                
            }
        }
 void licenseClient_licenseExpiredDateTimeChange(LicenseExpiredDateTimeArg obj)
 {
     if (obj.NewValue != obj.oldValue)
     {
         Dispatcher.BeginInvoke(() =>
         {
           txtContent.Text.Remove(0, txtContent.Text.Length);
            txtContent.Text = "라이센스가 업데이트되어 초기화했습니다. \n";
         });
     }
 }