How to check a check box?

I've tried so many different ways, but I can't get the check box to be checked! Here's what I've tried:


var reader = new iTextSharp.text.pdf.PdfReader(originalFormLocation);
using (var stamper = new iTextSharp.text.pdf.PdfStamper(reader,ms)) {
    var formFields = stamper.AcroFields;
    formFields.SetField("IsNo", "1");
    formFields.SetField("IsNo", "true");
    formFields.SetField("IsNo", "On");
None of them work. Any ideas?

Posted on StackOverflow on Oct 31, 2013 by user948060

You shouldn't "guess" for the possible values. You need to use a value that is stored in the PDF. Try the CheckBoxValues example to find these possible values:

public String getCheckboxValue(String src, String name) throws IOException {
    PdfReader reader = new PdfReader(SRC);
    AcroFields fields = reader.getAcroFields();
    // CP_1 is the name of a check box field
    String[] values = fields.getAppearanceStates("IsNo");
    StringBuffer sb = new StringBuffer();
    for (String value : values) {
    return sb.toString();

Or take a look at the PDF using RUPS. Go to the widget annotation and look for the normal (/N) appearance (AP) states. In my example theyu are /Off and /Yes:

Check box appearance states

Check box appearance states

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