Populated PDF with data I have , progrmatically

Hi, I download ASPOSE.pdf for NET. try to to read it with:

Document pdfDocument = new Document("101New.pdf");
 // Get a field
TextBoxField textBoxField = pdfDocument.Form["fill3_7"] as TextBoxField;

somehow I can not do it.

I work in company that try this as POC for select solution, we need stable product , cause we have many pdf to manipulate.
this is one of them:

https://taxes.gov.il/TaxesFormsList/itc101_13.pdf

@drormu,
We managed to replicate the problem of not being able to retrieve the form fields. It has been logged under the ticket ID PDFNET-43338 in our bug tracking system. We have linked your post to this ticket and will keep you informed regarding any available updates.