private void MainWindow_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
if (rtcControl.MyMeeting != String.Empty)
{
rtcControl.LeaveMeeting();
}
e.Cancel = false;
}
private void btnLeaveMeeting_Click(object sender, EventArgs e)
{
iconfRTC.LeaveMeeting();
}