/// <summary>
/// Acquires images from the automatic document feeder (ADF) of WIA device if document feeder has paper.
/// </summary>
public void AcquireImagesFromDocumentFeederOfWiaDeviceIfDocumentFeederHasPaper()
{
    // create WIA device manager
    using (Vintasoft.WiaImageScanning.WiaDeviceManager deviceManager = new Vintasoft.WiaImageScanning.WiaDeviceManager())
    {
        // open WIA device manager
        deviceManager.Open();

        // get count of WIA devices
        int deviceCount = deviceManager.Devices.Count;
        if (deviceCount == 0)
        {
            System.Console.WriteLine("Devices are not found.");
            return;
        }

        // select the first WIA device
        Vintasoft.WiaImageScanning.WiaDevice device = deviceManager.Devices[0];

        // open WIA device
        device.Open();

        // if device does not have paper in the document feeder
        if (device.DocumentHandlingStatus != Vintasoft.WiaImageScanning.WiaDocumentHandlingStatus.FeederReady)
        {
            System.Console.WriteLine("Device does not have paper in the document feeder.");
            return;
        }

        int imageIndex = 0;
        Vintasoft.WiaImageScanning.WiaAcquiredImage acquiredImage = null;
        do
        {
            try
            {
                // acquire image from WIA device
                acquiredImage = device.AcquireImageSync();
                // if image is received
                if (acquiredImage != null)
                {
                    imageIndex++;
                    string filename = string.Format("scannedImage-{0}.png", imageIndex);
                    if (System.IO.File.Exists(filename))
                        System.IO.File.Delete(filename);

                    acquiredImage.Save(filename);

                    System.Console.WriteLine(string.Format("Acquired image is saved to a file '{0}'.", filename));
                }
                // if image is not received
                else
                {
                    System.Console.WriteLine("Scan is completed.");
                    break;
                }
            }
            catch (System.Exception ex)
            {
                System.Console.WriteLine(string.Format("Scan is failed: {0}", ex.Message));
                break;
            }
        }
        // while image is acquired
        while (acquiredImage != null);

        // close WIA device
        device.Close();

        // close WIA device manager
        deviceManager.Close();
    }

    System.Console.ReadLine();
}

''' <summary>
''' Acquires images from the automatic document feeder (ADF) of WIA device if document feeder has paper.
''' </summary>
Public Sub AcquireImagesFromDocumentFeederOfWiaDeviceIfDocumentFeederHasPaper()
    ' create WIA device manager
    Using deviceManager As New Vintasoft.WiaImageScanning.WiaDeviceManager()
        ' open WIA device manager
        deviceManager.Open()

        ' get count of WIA devices
        Dim deviceCount As Integer = deviceManager.Devices.Count
        If deviceCount = 0 Then
            System.Console.WriteLine("Devices are not found.")
            Return
        End If

        ' select the first WIA device
        Dim device As Vintasoft.WiaImageScanning.WiaDevice = deviceManager.Devices(0)

        ' open WIA device
        device.Open()

        ' if device does not have paper in the document feeder
        If device.DocumentHandlingStatus <> Vintasoft.WiaImageScanning.WiaDocumentHandlingStatus.FeederReady Then
            System.Console.WriteLine("Device does not have paper in the document feeder.")
            Return
        End If

        Dim imageIndex As Integer = 0
        Dim acquiredImage As Vintasoft.WiaImageScanning.WiaAcquiredImage = Nothing
        Do
            Try
                ' acquire image from WIA device
                acquiredImage = device.AcquireImageSync()
                ' if image is received
                If acquiredImage IsNot Nothing Then
                    imageIndex += 1
                    Dim filename As String = String.Format("scannedImage-{0}.png", imageIndex)
                    If System.IO.File.Exists(filename) Then
                        System.IO.File.Delete(filename)
                    End If

                    acquiredImage.Save(filename)

                    System.Console.WriteLine(String.Format("Acquired image is saved to a file '{0}'.", filename))
                Else
                    ' if image is not received
                    System.Console.WriteLine("Scan is completed.")
                    Exit Try
                End If
            Catch ex As System.Exception
                System.Console.WriteLine(String.Format("Scan is failed: {0}", ex.Message))
                Exit Try
            End Try
            ' while image is acquired
        Loop While acquiredImage IsNot Nothing

        ' close WIA device
        device.Close()

        ' close WIA device manager
        deviceManager.Close()
    End Using

    System.Console.ReadLine()
End Sub