private void icc_CallRejected(string rejectionmessage) { Invoke(new MethodInvoker(delegate { DisplayMessage("Call rejected .."); icc.SetImage(null); icc.Parent = pnlOtherVideo; ics.Parent = pnlMain; pnlOtherVideo.Visible = false; pbHangup.Visible = false; pbCall.Visible = true; })); }