private void micVolumeTrackBar_Scroll(object sender, EventArgs e)
 {
     mMicVolume = this.micVolumeTrackBar.Value;
     this.micVolumeNumLabel.Text = mMicVolume + "%";
     mDeviceManager.setCurrentDeviceVolume(TRTCDeviceType.TXMediaDeviceTypeMic, (uint)(mMicVolume * 100 / 100));
 }