protected void ManipulatePdf(String dest)
{
PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));
PdfAcroForm form = PdfAcroForm.GetAcroForm(pdfDoc, true);
PdfTextFormField field = PdfFormField.CreateText(pdfDoc,
new Rectangle(36, 788, 523, 18), "myfile", "");
// If true is passed, then the text entered in the field will represent the pathname of a file
// whose contents are to be submitted as the value of the field.
field.SetFileSelect(true);
// When the mouse is released inside the annotation's area (that's what PdfName.U stands for),
// then the focus will be set on the "mytitle" field.
field.SetAdditionalAction(PdfName.U, PdfAction.CreateJavaScript(
"this.getField('myfile').browseForFileToSubmit();"
+ "this.getField('mytitle').setFocus();"));
form.AddField(field);
PdfTextFormField title = PdfFormField.CreateText(pdfDoc,
new Rectangle(36, 752, 523, 18), "mytitle", "");
form.AddField(title);
pdfDoc.Close();
}