Visual C#.NET: Twain Scan for Document & Images

using System.IO;
using System.Drawing.Printing;
using Yiigo.Imaging;
using Yiigo.Imaging.Processing;
using Yiigo.Imaging.TwainScan;

// Initialize Twain scan
private void Scanning()
{
    AcquireImage acq = new AcquireImage();
    acq.ImageAcquireImaged += new ImageAcquireImagedEventHandler(acq_ImageAcquireImaged);
    Device device = acq.Devices.Default;
    if (device.TryOpen())
    {
        device.ModalAcquireImage = true;
        device.AcquireImage();
        device.Close();
    }
}
void acq_ImageAcquireImaged(object sender, AcquireImageEventArgs e)
{
    Yiigo.Imaging myImage = Yiigo.Imaging.FromBitmap(e.Image);
}
// Acquire Size and Position
this.device.Units = UnitType.Inches;
if (this.device.Units != UnitType.Inches) return;
this.device.Frame = new System.Drawing.RectangleF(0, 0, 8.5, 11);

// Scan a multi page document into a PDF or TIFF file
public class AcquireImageClass
{
 private bool _acquireCanceled;
 private AcquireImage myAcquireImage = new AcquireImage(this);
 public void ScanImages()
 {
  _acquireCanceled = false;
  myAcquireImage.AcquireImageCanceled += new EventHandler(OnAcquireImageCanceled);
  myAcquireImage.AcquireImageFinished += new EventHandler(OnAcquireImageFinished);
  myAcquireImage.ImageAcquireImaged += new ImageAcquireImagedEventHandler(OnImageAcquireImaged);
  Device activeDevice = myAcquireImage.ShowSelectSource();
  activeDevice.AcquireImage(); 
 }
 private void OnImageAcquireImaged(object sender, AcquireImageEventArgs e) 
 {
  if (e.Image != null)
  {
   TiffEncoder enc = new TiffEncoder(TiffCompression.Default, true);
   FileStream fs = new FileStream("outputTiff.tif",FileMode.OpenOrCreate, FileAccess.ReadWrite);
   enc.Save(fs, Yiigo.Imaging.FromBitmap(e.Image), null);
   fs.Close();
  }
 }
 private void OnAcquireImageCanceled(object sender, EventArgs e)
 {
  _acquireCanceled = true;
 }
 private void OnAcquireImageFinished(object sender, EventArgs e)
 {
  if (_acquireCanceled)
   return;
  PdfImageCollection col = new PdfImageCollection();
  TiffDecoder dec = new TiffDecoder();
  FileStream fs = new FileStream("outputTiff.tif", FileMode.Open, FileAccess.Read);
  int frameCount = dec.GetFrameCount(fs);
  fs.Close();
  for(int i=0; i< frameCount; i++)
   col.Add(new PdfImage("outputTiff.tif", i, PdfCompressionType.Auto));
    
  FileStream outStream = new FileStream("outputPdf.pdf", FileMode.OpenOrCreate, FileAccess.ReadWrite);
  PdfEncoder enc = new PdfEncoder();
  enc.Save(outStream, col, null); 
 }
}
// Upload Image to Sever
private void UploadImage(System.Drawing.Bitmap image)
{
Yiigo.Twain.HttpPost post = new Yiigo.Twain.HttpPost(); post.FormData.Add("image1", image, 
"filename.png");
post.FormData.Add("username", user);
post.FormData.Add("password", password);
string ret = post.PostData("http://www.website.com/postImage.aspx");
}