Public Delegate Function FormProgressCallback( _
   ByVal currentPage As Integer, _
   ByVal totalPages As Integer, _
   ByVal percentage As Integer _
) As Boolean

Dim instance As New FormProgressCallback(AddressOf HandlerMethod)

public delegate bool FormProgressCallback( 
   int currentPage,
   int totalPages,
   int percentage
)

public delegate bool FormProgressCallback( 
   int currentPage,
   int totalPages,
   int percentage
)

Public Function ProgressCallbackExample(ByVal recognitionEngine As FormRecognitionEngine, ByVal master As FormRecognitionAttributes, ByVal form As FormRecognitionAttributes) As FormRecognitionResult
   Return recognitionEngine.CompareForm(master, form, AddressOf MyFormProgressCallback, AddressOf MyPageProgressCallback)
End Function
Private Sub MyPageProgressCallback(ByVal data As PageProgressCallbackData)
   If data.Percentage = 0 Then
      Console.WriteLine("--------------------------")
   End If

   Console.WriteLine("Page progress:{0}%", data.Percentage.ToString("000"))
End Sub

Private Function MyFormProgressCallback(ByVal currentPage As Integer, ByVal totalPages As Integer, ByVal percentage As Integer) As Boolean
   If percentage = 0 Then
      Console.WriteLine("--------------------------")
   End If

   Console.WriteLine("Page:{0}/{1} {2}%", currentPage.ToString("00"), totalPages.ToString("00"), percentage.ToString("000"))

   Return False
End Function

// Text writer to save the log to 
public FormRecognitionResult ProgressCallbackExample(FormRecognitionEngine recognitionEngine, FormRecognitionAttributes master, FormRecognitionAttributes form)
{
   return recognitionEngine.CompareForm(master, form, MyFormProgressCallback, MyPageProgressCallback);
}
private void MyPageProgressCallback(PageProgressCallbackData data)
{
   if(data.Percentage == 0)
      Console.WriteLine("--------------------------");

   Console.WriteLine("Page progress:{0}%", data.Percentage.ToString("000"));
}

private bool MyFormProgressCallback(int currentPage, int totalPages, int percentage)
{
   if(percentage == 0)
      Console.WriteLine("--------------------------");

   Console.WriteLine("Page:{0}/{1} {2}%",
      currentPage.ToString("00"),
      totalPages.ToString("00"),
      percentage.ToString("000")); 

   return false;
}