private void button6_Click(object sender, EventArgs e)
{
if (comboBox1.SelectedItem != null)
{
DeviceItem item = (DeviceItem)comboBox1.SelectedItem;
DeviceListener.Device d = deviceListener.Find(item.id);
int vol = (int)numericUpDown1.Value;
deviceListener.AudioSetVolume(d, vol);
}
}