when filling a pdf document with pdfsharp, the filled form doesn't show the values unless the fields are clicked on

Question

When filling a pdf document with pdfsharp (pdfsharpcore), the filled form doesn't show the values in the acrobat reader unless the fields are clicked on.

Answer 1

In order to make the values visible, I've inserted.

if (acroForms.Elements.ContainsKey("/NeedAppearances"))
    acroForms.Elements["/NeedAppearances"] = new PdfBoolean(true);
else
    acroForms.Elements.Add("/NeedAppearances", new PdfBoolean(true));

and it works.