Use EO.PDF to add form fieldst o a PDF

EO-PDF-Forms.cs

//File.WriteAllText(@"c:\temp\before.htm", html);

// Ensure all inputs have an ID
var htmlDoc = new HtmlAgilityPack.HtmlDocument();
htmlDoc.OptionWriteEmptyNodes = true;
htmlDoc.LoadHtml(html);
var srcInputs = htmlDoc.DocumentNode.SelectNodes("//input");
foreach (var item in srcInputs)
{
    if (item.Id.Trim().Length == 0)
        item.SetAttributeValue("id", Guid.NewGuid().ToString("N"));
}
var sw = new StringWriter();
htmlDoc.Save(sw);
html = sw.ToString();
//File.WriteAllText(@"c:\temp\after.htm", html);

// Convert to PDF
PdfDocument pdf = new PdfDocument();
var conversion = EO.Pdf.HtmlToPdf.ConvertHtml(html, pdf, pdfOptions);

// Find <input>s and overlay PDF controls
var inputs = conversion.HtmlDocument.GetElementsByTagName("INPUT");
int i = 0;
foreach (HtmlElement input in inputs)
{
    Debug.WriteLine(input.Name + ": '" + input.ClassName + "'");
    AcmContent acmContent = null;
    var srcInput = srcInputs.Single(x => x.Id == input.ID);
    var inputType = srcInput.GetAttributeValue("type", "text");
    if (inputType == "text")
    {
        var txt = new AcmTextBox();
        acmContent = txt;
        txt.Name = input.Name ?? input.ID;

        txt.Style.OffsetX = input.Location.X;
        txt.Style.OffsetY = input.Location.Y;
        txt.Style.Height = input.Size.Height;
        txt.Style.Width = input.Size.Width;
    }
    else if (inputType == "radio")
    {
        var chk = new AcmCheckBox();
        acmContent = chk;

        chk.Style.OffsetX = input.Location.X - 0.1f;
        chk.Style.OffsetY = input.Location.Y;
        chk.Style.Height = input.Size.Height;
        chk.Style.Width = input.Size.Width;

        chk.Style.Border = new AcmBorder(new AcmLineInfo(Color.Black, 0.01f));

        chk.Name = (input.Name ?? input.ID) + ":" + i;
    }

    var render = new AcmRender(input.Location.Page, 0, new AcmPageLayout(new AcmPadding(0, 0, 0, 0)));
    render.Render(acmContent);
    i++;
}