private void btnParticipantDrop_Click(object sender, EventArgs e) { if (conferenceInProgress != null) { if (cbParticipantsList.SelectedIndex < conferenceInProgress.Participants.Count) { Conference.Participant participant = conferenceInProgress.Participants[cbParticipantsList.SelectedIndex]; rainbowBubbles.ConferenceDropParticipant(conferenceInProgress.Id, participant.Id, callback => { if (callback.Result.Success) { AddStateLine(String.Format("Personal Conference - Drop Participant done")); } else { AddStateLine("Pb to Drop Participant ..."); log.LogDebug("Pb to Drop Participant - error:[{0}]", Util.SerializeSdkError(callback.Result)); } }); } } }