Not able to see pdftextfield value in pdf file

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C#

.NET

PDF

Hi,

I am using PDFSharp.dll to edit the pdf file and save it on local machine. It is working fine, i am able to update the existing text field value. But the problem is when i open updated file in pdf reader the text field is blank until clicked on it.

I can see the value if open that pdf in crome pdf reader. only problem with acrobat pdf reader.

Could any please help me why value is hidden in acrobat pdf reader? any kind of help will me much appreciated.

What I have tried:

if (!Document.AcroForm.Elements.ContainsKey("/NeedAppearances"))
    Document.AcroForm.Elements.Add("/NeedAppearances", new PdfBoolean(true));
else
    Document.AcroForm.Elements.Add("/NeedAppearances", new PdfBoolean(true));

PdfTextField texttField =  (PdfTextField)Document.AcroForm.Fields[field.DataField.DocumentMapAddress];
                       
PdfString pdfStr = new PdfString(field.UserEnteredValue.ToString());
texttField.Font = new XFont("Arial", 8);
texttField.Value = pdfStr;