private void usrRecAudio_Load(object sender, EventArgs e)
 {
     cmbInputDevices.DataSource    = RecordWaveAudio.InputAudioDevices();
     cmbInputDevices.SelectedIndex = 0;
 }
 private void button2_Click(object sender, EventArgs e)
 {
     comboBox1.DataSource = RecordWaveAudio.InputAudioDevices();
 }