private void buttonAccept_Click(object sender, RoutedEventArgs e)
{
buttonAccept.Visibility = Visibility.Hidden;
buttonCancel.Visibility = Visibility.Hidden;
buttonClose.Visibility = Visibility.Visible;
WaveIn wi = new WaveIn();
wi.WaveFormat = ClientInformation.waveFormat;
wi.DataAvailable += new EventHandler <WaveInEventArgs>(wi_DataAvailableCallback);
audioCallback.Wi = wi;
audioService.Confirmation(ClientInformation.Username, ConversationPartner, true, IsGroup);
audioCallback.StartRecording();
textBlock.Text = "Audio Call with " + ConversationPartner;
}
