How to use iTextSharp to populate radio button

Question

I have a table and one of the column is YesNo which is of type varchar(3). I have two radio buttons in my PDF file which is in an array:

pg1rb (radio group field)
 --> c1 (radio button one (yes))
 --> c2 (radio button two (no))

I set textboxes like this in my code:

formFieldMap["topmostSubform[0].Page1[0].f1_01_0_[0]"] = reader.GetValue(0).ToString();

How can I select YES or NO radio button based on the row value?

Can I do something like this:

formFieldMap["pg1rb"] = reader.GetBoolean(10); //10 is the 9th column which is Yes/No value

Or do I get the value and based on it select the radio button, something like this:

if (reader.GetValue(10).ToString() == "Yes") {
     formFieldMap["pg1rb"][c1] = "1";
else {
     formFieldMap["pg1rb"][c2] = "1";
}

My SQL table:

I am trying to follow this site: Website example

My function that actually does the conversion:

public void writeData(string k, string c)
    {
        Conn = new SqlConnection(cString);
        Conn.Open();

        //MessageBox.Show(k);
        //MessageBox.Show(c);

        var pdfPath = Path.Combine(Server.MapPath("~/PDFTemplates/forme.pdf"));

        // Get the form fields for this PDF and fill them in!
        var formFieldMap = PDFHelper.GetFormFieldNames(pdfPath);

        //if more than multiple entries, verify by name and the last four ssn
        sqlCode = "SELECT * FROM [DSPCONTENT01].[dbo].[TablePDFTest] WHERE [name] = '" + k + "' AND [ssn3] = " + c + "";
        //sqlCode = "SELECT * FROM [DSPCONTENT01].[dbo].[TablePDFTest] WHERE [name] = @name2 AND [ssn3] = @ssnnum";
        //MessageBox.Show("" + sqlCode.ToString());

        using (SqlCommand command = new SqlCommand(sqlCode, Conn))
        {
            command.CommandType = CommandType.Text;
            //command.Parameters.AddWithValue("name2", k);
            //command.Parameters.AddWithValue("ssnnum", c);

            using (reader = command.ExecuteReader())
            {
                if (reader.HasRows)
                {
                    if (reader.Read())
                    {
                        //MessageBox.Show(reader.GetValue(0).ToString());
                        /*formFieldMap["topmostSubform[0].Page1[0].f1_01_0_[0]"] = reader.GetValue(0).ToString();
                        formFieldMap["topmostSubform[0].Page1[0].f1_02_0_[0]"] = reader.GetValue(1).ToString();
                        formFieldMap["topmostSubform[0].Page1[0].f1_04_0_[0]"] = reader.GetValue(2).ToString();
                        formFieldMap["topmostSubform[0].Page1[0].f1_05_0_[0]"] = reader.GetValue(3).ToString();
                        formFieldMap["topmostSubform[0].Page1[0].f1_07_0_[0]"] = reader.GetValue(4).ToString();
                        formFieldMap["topmostSubform[0].Page1[0].social[0].TextField1[0]"] = reader.GetValue(5).ToString();
                        formFieldMap["topmostSubform[0].Page1[0].social[0].TextField2[0]"] = reader.GetValue(6).ToString();
                        formFieldMap["topmostSubform[0].Page1[0].social[0].TextField2[1]"] = reader.GetValue(7).ToString();
                        formFieldMap["topmostSubform[0].Page1[0].social[0].TextField2[2]"] = reader.GetValue(8).ToString();
                        formFieldMap["topmostSubform[0].Page1[0].social[0].TextField2[3]"] = reader.GetValue(9).ToString();*/
                        if (reader.GetValue(10).ToString() == "Yes")
                        {
                            //MessageBox.Show("YES");
                        }
                        else if (reader.GetValue(10).ToString() == "No")
                        {
                            //MessageBox.Show("NO");
                        }
                    }
                }
            }
        }

        // Requester's name and address (hard-coded)
        formFieldMap["topmostSubform[0].Page1[0].f1_06_0_[0]"] = "Medical Group\n12 Westchester Ave\nPurchase, NY 10121";

        var pdfContents = PDFHelper.GeneratePDF(pdfPath, formFieldMap);

        PDFHelper.ReturnPDF(pdfContents, "Completed-W9.pdf");
    }

The PDFHelper class:

using System;
using System.Collections.Generic;
using System.Collections;
using System.Linq;
using System.Web;
using System.IO;
using iTextSharp.text.pdf;

public class PDFHelper
{
    public static Dictionary<string, string> GetFormFieldNames(string pdfPath)
    {
        var fields = new Dictionary<string, string>();

        var reader = new PdfReader(pdfPath);
        foreach (DictionaryEntry entry in reader.AcroFields.Fields)
            fields.Add(entry.Key.ToString(), string.Empty);
        reader.Close();

        return fields;
    }

    public static byte[] GeneratePDF(string pdfPath, Dictionary<string, string> formFieldMap)
    {
        var output = new MemoryStream();
        var reader = new PdfReader(pdfPath);
        var stamper = new PdfStamper(reader, output);
        var formFields = stamper.AcroFields;

        foreach (var fieldName in formFieldMap.Keys)
            formFields.SetField(fieldName, formFieldMap[fieldName]);

        stamper.FormFlattening = false;
        stamper.Close();
        reader.Close();

        return output.ToArray();
    }

    // See http://stackoverflow.com/questions/4491156/get-the-export-value-of-a-checkbox-using-itextsharp/
    public static string GetExportValue(AcroFields.Item item)
    {
        var valueDict = item.GetValue(0);
        var appearanceDict = valueDict.GetAsDict(PdfName.AP);

        if (appearanceDict != null)
        {
            var normalAppearances = appearanceDict.GetAsDict(PdfName.N);
            // /D is for the "down" appearances.

            // if there are normal appearances, one key will be "Off", and the other
            // will be the export value... there should only be two.
            if (normalAppearances != null)
            {
                foreach (var curKey in normalAppearances.Keys)
                    if (!PdfName.OFF.Equals(curKey))
                        return curKey.ToString().Substring(1); // string will have a leading '/' character, so remove it!
            }
        }

        // if that doesn't work, there might be an /AS key, whose value is a name with 
        // the export value, again with a leading '/', so remove it!
        var curVal = valueDict.GetAsName(PdfName.AS);
        if (curVal != null)
            return curVal.ToString().Substring(1);
        else
            return string.Empty;
    }

    public static void ReturnPDF(byte[] contents)
    {
        ReturnPDF(contents, null);
    }

    public static void ReturnPDF(byte[] contents, string attachmentFilename)
    {
        var response = HttpContext.Current.Response;

        if (!string.IsNullOrEmpty(attachmentFilename))
            response.AddHeader("Content-Disposition", "attachment; filename=" + attachmentFilename);

        response.ContentType = "application/pdf";
        response.BinaryWrite(contents);
        response.End();
    }
}

Answer 1

Your question was confusing because it used a reader object that didn't refer to iTextSharp's PdfReader class and it used a formFieldMap object of which the type was unknown (it doesn't seem related to iTextSharp). Your edit was very welcome to understand the question.

The field names you mention look as if they are fields in an XFA form, but the article you refer to talks about filling out AcroForm documents, so let's assume that your form was indeed born as an XFA form, but later on converted to an AcroForm.

In this case, nobody will be able to tell you which values to pick to set the radio buttons without seeing the PDF. Please download chapter 6 of my book and read section 6.3.5, more specifically where it says Inspecting the form and its fields. On page 183, you can read that the possible values for a group of radio buttons is either "Off"–no radio button is selected— or a code that is defined in the form itself.

For instance: in the example from the book, the possible values for the category group were spec, toro, anim, etc...

This means that you can set a radio box in that group like this:

formFields.SetField("category", "spec");

or:

formFields..SetField("category", "toro");

or:

formFields.SetField("category", "anim");

and so on.

So, if you want to set a radio button in a radiogroup named pg1rb, you first need to know which are the possible values. You assume that the possible values are "Yes" and "No" in which case you could use:

formFields.SetField("pg1rb", "Yes");

or

formFields.SetField("pg1rb", "No");

But the possible values could also be "1" and "0", "On" and "Off", "true" and "false",... The possible values were chosen by the person who created the form.

You can get these values programmatically by using the code from page 182:

StringBuilder sb = new StringBuilder();
sb.Append("Possible values for pg1rb:");
sb.Append(Environment.NewLine);
states = form.GetAppearanceStates("pg1rb");
for (int i = 0; i < states.Length - 1; i++) {
    sb.Append(states[i]);
    sb.Append(", ");
}
sb.Append(states[states.Length - 1]);

Inspect what was written to the sb object and you have the values you are looking for.