VintaSoft Twain .NET SDK v10.2
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    How to scan pages from the automatic document feeder (ADF) of scanner?
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    DocumentFeeder class allows to control the document feeder of the device.


    Example: Here is an example that shows how to use document feeder of the device.

    ''' <summary>
    ''' Acquire images from the document feeder.
    ''' </summary>
    Public Sub AcquireImagesFromAdf(ByVal device As Vintasoft.Twain.Device)
        ' disable UI
        device.ShowUI = False
    
        ' open the device
        device.Open()
        ' specify that color images must be acquired
        device.PixelType = Vintasoft.Twain.PixelType.RGB
        ' set the inches as unit of measure
        device.UnitOfMeasure = Vintasoft.Twain.UnitOfMeasure.Inches
        ' set the desired resolution of acquired images
        device.Resolution = New Vintasoft.Twain.Resolution(200.0F, 200.0F)
    
        ' if device has feeder
        If device.HasFeeder Then
            ' enable feeder
            device.DocumentFeeder.Enabled = True
            ' specify that application want to acquire all pages from the feeder
            device.XferCount = -1
    
            ' if pages can be scanned in duplex mode
            If device.DocumentFeeder.DuplexMode <> Vintasoft.Twain.DuplexMode.None Then
                ' enable duplex scanning
                device.DocumentFeeder.DuplexEnabled = True
            End If
    
            ' if feeder can detect paper
            If device.DocumentFeeder.PaperDetectable Then
                ' if feeder is loaded
                If device.DocumentFeeder.Loaded Then
                    ' acquire images asynchronously
                    device.Acquire()
                End If
            Else
                ' if feeder cannot detect paper
                ' acquire images asynchronously
                device.Acquire()
            End If
        End If
    End Sub
                  
    
    /// <summary>
    /// Acquire images from the document feeder.
    /// </summary>
    public void AcquireImagesFromAdf(Vintasoft.Twain.Device device)
    {
        // disable UI
        device.ShowUI = false;
    
        // open the device
        device.Open();
        // specify that color images must be acquired
        device.PixelType = Vintasoft.Twain.PixelType.RGB;
        // set the inches as unit of measure
        device.UnitOfMeasure = Vintasoft.Twain.UnitOfMeasure.Inches;
        // set the desired resolution of acquired images
        device.Resolution = new Vintasoft.Twain.Resolution(200f, 200f);
    
        // if device has feeder
        if (device.HasFeeder)
        {
            // enable feeder
            device.DocumentFeeder.Enabled = true;
            // specify that application want to acquire all pages from the feeder
            device.XferCount = -1;
    
            // if pages can be scanned in duplex mode
            if (device.DocumentFeeder.DuplexMode != Vintasoft.Twain.DuplexMode.None)
                // enable duplex scanning
                device.DocumentFeeder.DuplexEnabled = true;
    
            // if feeder can detect paper
            if (device.DocumentFeeder.PaperDetectable)
            {
                // if feeder is loaded
                if (device.DocumentFeeder.Loaded)
                    // acquire images asynchronously
                    device.Acquire();
            }
            // if feeder cannot detect paper
            else
                // acquire images asynchronously
                device.Acquire();
        }
    }