Write to a PDF form having no editable Form fields

[RupaMistry]

Hi,

I have a PDF that has no editable form fields defined but has read-only textbox like controls.
I want to read the PDF file and place an appropriate value into the textbox.
Currently,when i try to read the pdfStamper.AcroFields property of this pdf..it shows a count of 0(i.e no fields found)
Attached :  is the image of the PDF file i am working on.
Any help would be greatly appreciated.

Thanks and Regards,
Rupa Mistry.