How do I make text field visible on pdf form

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C#

PDF

Hi,

I have pdf form in which i am filling values using iTextSharp. I wanted to add some more text boxed in the same pdf form. I have written code for that but text boxes are not visible on pdf. If i open pdf with Notepad++ then i can see the text field name and values. that means text boxes are there on pdf but it is not visible.

So could some please help me how do i make text field visible on pdf form?

What I have tried:

try
            {
                iTextSharp.text.pdf.PdfReader reader = new iTextSharp.text.pdf.PdfReader(SrcFile);
                PdfStamper stamper = new PdfStamper(reader, new FileStream(DestFile, FileMode.Append));

                TextField textname = new TextField(stamper.Writer, new Rectangle(36, 700, 136, 680), "TxtName");
                textname.Text = "softwareid1";
                textname.TextColor = new BaseColor(255, 0, 0);
                textname.BackgroundColor = BaseColor.LIGHT_GRAY;

                TextField textmail = new TextField(stamper.Writer, new Rectangle(36, 660, 136, 640), "TxtMail");
                textmail.Text = "SoftwareId2";
                textmail.Options = TextField.MULTILINE;
                textmail.TextColor = new BaseColor(255, 0, 0);
                textmail.BackgroundColor = BaseColor.LIGHT_GRAY;

                stamper.AddAnnotation(textname.GetTextField(), 1);
                stamper.AddAnnotation(textmail.GetTextField(), 1);
                stamper.AcroFields.GenerateAppearances = true;

                stamper.Close();
            }
            catch (Exception ex)
            { }