void scan(string scannerId)
        {
            scanner = null;
            foreach (WIA.DeviceInfo devInfo in manager.DeviceInfos)
            {
                if (devInfo.DeviceID == scannerId)
                {
                    scanner = devInfo.Connect();
                }
            }
            if (scanner == null)
            {
                throw new Exception("Selected scanner is unavailable!");
            }

            WIA.Item item = scanner.Items[1];

            try
            {
                commonDialog = null;
                commonDialog = new WIA.CommonDialog();
                scanInit();
                scannedImage = (WIA.ImageFile)commonDialog.ShowTransfer(item, wiaFormatBMP, false);
                imageBytes   = (byte[])scannedImage.FileData.get_BinaryData();
                MemoryStream ms = new MemoryStream(imageBytes);
                image = Image.FromStream(ms);
                pbScannedImage.Image = image;
            }
            catch (Exception e)
            {
                throw e;
            }
            finally
            {
                Marshal.ReleaseComObject(scannedImage);
            }
        }
 private void buttonChooseScanner_Click(object sender, EventArgs e)
 {
     commonDialog = new WIA.CommonDialog();
     scanner      = commonDialog.ShowSelectDevice(WIA.WiaDeviceType.UnspecifiedDeviceType, true, false);
 }