protected virtual void OnChanged(RefreshIntervalEventArgs e)
        {
            var handler = RefreshIntervalChanged;

            if (null == handler)
            {
                return;
            }
            handler(this, e);
        }
 protected virtual void OnChanged(RefreshIntervalEventArgs e)
 {
     var handler = RefreshIntervalChanged;
     if (null == handler) return;
     handler(this, e);
 }