Public Sub StopFeeder() 

Dim instance As TwainSession
 
instance.StopFeeder()

public void StopFeeder()

public:
void StopFeeder(); 

Dim acq_session As TwainSession
   Private Sub twain_AcquirePage(ByVal sender As Object, ByVal e As TwainAcquirePageEventArgs)
      ' get acquired image here

      ' call StopFeeder method here if you need to stop the feeder
      acq_session.StopFeeder()
   End Sub

   Public Sub AcquireExample(ByVal parent As IWin32Window)
      acq_session = New TwainSession()
      acq_session.Startup(parent, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None)

      acq_session.SelectSource(String.Empty)

      Dim props As TwainProperties = acq_session.Properties
      Dim dataProps As TwainDataTransferProperties = props.DataTransfer
      dataProps.FileName = Path.Combine(LEAD_VARS.ImagesDir, "twain.bmp")
      dataProps.MemoryBufferSize = dataProps.MemoryBufferSize * 2
      props.DataTransfer = dataProps
      acq_session.Properties = props
      Dim opts As TwainTransferOptions = acq_session.TransferOptions

      AddHandler acq_session.AcquirePage, AddressOf twain_AcquirePage

      If acq_session.Acquire(TwainUserInterfaceFlags.Show) <> DialogResult.OK Then
         MessageBox.Show("Error Acquiring From Source")
      End If

      acq_session.Shutdown()
   End Sub

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

TwainSession acq_session;
   private void twain_AcquirePage(object sender, TwainAcquirePageEventArgs e)
   {
      // get acquired image here

      // call StopFeeder method here if you need to stop the feeder
      acq_session.StopFeeder();
   }

   public void AcquireExample(IWin32Window parent)
   {
      acq_session = new TwainSession();
      acq_session.Startup(parent, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None);

      acq_session.SelectSource(String.Empty);

      TwainProperties props = acq_session.Properties;
      TwainDataTransferProperties dataProps = props.DataTransfer;
      dataProps.FileName = Path.Combine(LEAD_VARS.ImagesDir, "twain.bmp");
      dataProps.MemoryBufferSize = dataProps.MemoryBufferSize * 2;
      props.DataTransfer = dataProps;
      acq_session.Properties = props;
      TwainTransferOptions opts = acq_session.TransferOptions;

      acq_session.AcquirePage += new EventHandler<TwainAcquirePageEventArgs>(twain_AcquirePage);

      if (acq_session.Acquire(TwainUserInterfaceFlags.Show) != DialogResult.OK)
         MessageBox.Show("Error Acquiring From Source");

      acq_session.Shutdown();
   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}