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int oldDeviceCount = 0;
int newDeviceCount = 0;

// create the device manager
using (DeviceManager deviceManager = new DeviceManager())
{
    // open the device manager
    deviceManager.Open();

    // get device count
    oldDeviceCount = deviceManager.Devices.Count;

    // close the device manager
    deviceManager.Close();
}

Console.WriteLine("Please detach one or several USB TWAIN devices.");
Console.WriteLine("Press any key when done.");
Console.ReadKey();

// create new device manager
using (DeviceManager deviceManager = new DeviceManager())
{
    // open the device manager
    deviceManager.Open();

    // get device count
    newDeviceCount = deviceManager.Devices.Count;

    // close the device manager
    deviceManager.Close();
}

if (oldDeviceCount <= newDeviceCount)
    throw new ApplicationException("Device list is not refreshed.");