delegate void delegateUpdateProgress(int _ProgressValue); this.Invoke(new delegateUpdateProgress(this.UpdateProgress), new object[] { 'some value' }); private void UpdateProgress(int _ProgressValue) { this.UltraStatusBar.Panels["Progress"].Visible = true; this.UltraStatusBar.Panels["Progress"].ProgressBarInfo.Value = _ProgressValue; } MSDN Artikel