ScanOne.cs

private XImage ScanOne()
{
    XImage ximage = null;

    try
    {
        // find our device (scanner previously selected with commonDialog.ShowSelectDevice)
        DeviceManager manager = new DeviceManager();
        DeviceInfo deviceInfo = null;
        foreach (DeviceInfo info in manager.DeviceInfos)
        {
            if (info.DeviceID == _deviceId)
            {
                deviceInfo = info;
            }
        }

        if (deviceInfo != null)
        {                    
            Device device = deviceInfo.Connect();
            CommonDialog commonDialog = new CommonDialog();

            Item item = device.Items[1];
            int dpi = 150;

            // configure item
            SetItemIntProperty(ref item, 6146, 2); // greyscale
            SetItemIntProperty(ref item, 6147, dpi); // 150 dpi
            SetItemIntProperty(ref item, 6148, dpi); // 150 dpi
            SetItemIntProperty(ref item, 6151, (int)(dpi * _width)); // scan width
            SetItemIntProperty(ref item, 6152, (int)(dpi * _height)); // scan height
            SetItemIntProperty(ref item, 4104, 8); // bit depth

            int deviceHandling = _adf ? 1 : 2; // 1 for ADF, 2 for flatbed

            // configure device
            SetDeviceIntProperty(ref device, 3088, deviceHandling); 
            int handlingStatus = GetDeviceIntProperty(ref device, 3087);

            if (handlingStatus == deviceHandling)
            {
                ImageFile image = commonDialog.ShowTransfer(item, formatJpeg, true);

                // save image to a temp file and then load into an XImage
                string tempPath = System.IO.Path.GetTempFileName();
                File.Delete(tempPath);
                tempPath = System.IO.Path.ChangeExtension(tempPath, "jpg");
                image.SaveFile(tempPath);
                ximage = XImage.FromFile(tempPath);

                _tempFilesToDelete.Add(tempPath);
            }
        }
    }
    catch (COMException ex)
    {
        ximage = null;

        // paper empty
        if ((uint)ex.ErrorCode != 0x80210003)
        {
            throw;
        }
    }

    return ximage;
}