How to read data from check box in PDF using iTextsharp?

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VB

C#5.0

We are trying to read data from PDF file using pixel coordinates (by using iTextsharp). below is the sample code and working to retrieve data from text boxes

string file = @"E:\CA Dan Truman Services.pdf";
    PdfReader reader = new PdfReader(file);
     Rectangle rect = new Rectangle(18, 558, 32, 570);  
     RenderFilter[] renderFilter = { new RegionTextRenderFilter(rect) }; 

but its not working while retrieving data from check box.

Please let us know that how can we read data from check box using above mentioned code .

Any suggestions is highly appreciated.



Regards
Nanda Kishore.CH