private void micDeviceComboBox_SelectedIndexChanged(object sender, EventArgs e)
 {
     if (String.IsNullOrEmpty(this.micDeviceComboBox.Text))
     {
         return;
     }
     for (uint i = 0; i < mMicDeviceList.getCount(); i++)
     {
         if (mMicDeviceList.getDeviceName(i).Equals(this.micDeviceComboBox.Text))
         {
             mDeviceManager.setCurrentDevice(TRTCDeviceType.TXMediaDeviceTypeMic, mMicDeviceList.getDevicePID(i));
             mMainForm.OnMicDeviceChange(mMicDeviceList.getDevicePID(i));
         }
     }
 }