Private Shared Sub AcquiredImagesWithDualStream()
        ' create the device manager
        Using deviceManager As New Vintasoft.Twain.DeviceManager()
                ' open the device manager
                deviceManager.Open()

                ' get reference to Kodak scanner
                Dim device As Vintasoft.Twain.Device = deviceManager.Devices.Find("KODAK Scanner: i1410/i1420/i1440")

                ' disable UI
                device.ShowUI = False

                ' open device
                device.Open()

                ' set inches as units of measure
                device.UnitOfMeasure = Vintasoft.Twain.UnitOfMeasure.Inches
                ' enable duplex
                device.DocumentFeeder.DuplexEnabled = True

                ' select color camera
                device.Cameras.SetSelectedCamera("/Camera_Color_Both")
                ' set resolution for color images
                device.Resolution = New Vintasoft.Twain.Resolution(300, 300)
                ' enable color camera
                device.Cameras.EnableSelectedCamera()

                ' select black-white camera
                device.Cameras.SetSelectedCamera("/Camera_Bitonal_Both")
                ' set resolution for black-white images
                device.Resolution = New Vintasoft.Twain.Resolution(200, 200)
                ' enable black-white camera
                device.Cameras.EnableSelectedCamera()


                ' modally acquire images from the scanner
                Dim acquireModalState As Vintasoft.Twain.AcquireModalState = Vintasoft.Twain.AcquireModalState.None
                Dim acquiredImageInfo As Vintasoft.Twain.ImageInfo
                Do
                        ' acquire image from scanner
                        acquireModalState = device.AcquireModal()

                        ' write information about acquired image
                        If acquireModalState = Vintasoft.Twain.AcquireModalState.ImageAcquired Then
                                ' get info about acquired image
                                acquiredImageInfo = device.AcquiredImage.ImageInfo
                                ' output info about acquired image
                                System.Console.WriteLine(acquiredImageInfo.PixelType.ToString() & " " & acquiredImageInfo.Resolution.ToString())

                                ' dispose the acquired image
                                device.AcquiredImage.Dispose()
                        End If
                Loop While acquireModalState <> Vintasoft.Twain.AcquireModalState.None

                ' close the device
                device.Close()

                ' close TWAIN device manager
                deviceManager.Close()
        End Using
End Sub

private static void AcquiredImagesWithDualStream()
{
    // create the device manager
    using (Vintasoft.Twain.DeviceManager deviceManager = new Vintasoft.Twain.DeviceManager())
    {
        // open the device manager
        deviceManager.Open();

        // get reference to Kodak scanner
        Vintasoft.Twain.Device device = deviceManager.Devices.Find("KODAK Scanner: i1410/i1420/i1440");

        // disable UI
        device.ShowUI = false;

        // open device
        device.Open();

        // set inches as units of measure
        device.UnitOfMeasure = Vintasoft.Twain.UnitOfMeasure.Inches;
        // enable duplex
        device.DocumentFeeder.DuplexEnabled = true;

        // select color camera
        device.Cameras.SetSelectedCamera("/Camera_Color_Both");
        // set resolution for color images
        device.Resolution = new Vintasoft.Twain.Resolution(300, 300);
        // enable color camera
        device.Cameras.EnableSelectedCamera();

        // select black-white camera
        device.Cameras.SetSelectedCamera("/Camera_Bitonal_Both");
        // set resolution for black-white images
        device.Resolution = new Vintasoft.Twain.Resolution(200, 200);
        // enable black-white camera
        device.Cameras.EnableSelectedCamera();


        // modally acquire images from the scanner
        Vintasoft.Twain.AcquireModalState acquireModalState = Vintasoft.Twain.AcquireModalState.None;
        Vintasoft.Twain.ImageInfo acquiredImageInfo;
        do
        {
            // acquire image from scanner
            acquireModalState = device.AcquireModal();

            // write information about acquired image
            if (acquireModalState == Vintasoft.Twain.AcquireModalState.ImageAcquired)
            {
                // get info about acquired image
                acquiredImageInfo = device.AcquiredImage.ImageInfo;
                // output info about acquired image
                System.Console.WriteLine(acquiredImageInfo.PixelType.ToString() + " " + acquiredImageInfo.Resolution.ToString());

                // dispose the acquired image
                device.AcquiredImage.Dispose();
            }
        }
        while (acquireModalState != Vintasoft.Twain.AcquireModalState.None);

        // close the device
        device.Close();

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