public virtual void WriteUtf8FieldNameAndValue()
        {
            PdfDocument      pdfDoc = new PdfDocument(new PdfWriter(destinationFolder + "writeUtf8FieldNameAndValue.pdf"));
            PdfAcroForm      form   = PdfAcroForm.GetAcroForm(pdfDoc, true);
            PdfTextFormField field  = PdfTextFormField.CreateText(pdfDoc, new Rectangle(99, 753, 425, 15), "", "");

            field.SetFont(PdfFontFactory.CreateFont(FONT, PdfEncodings.IDENTITY_H));
            //  لا
            field.Put(PdfName.T, new PdfString("\u0644\u0627", PdfEncodings.UTF8));
            //  福昕 福昕UTF8
            field.Put(PdfName.V, new PdfString("\u798F\u6615 \u798F\u6615UTF8", PdfEncodings.UTF8));
            field.RegenerateField();
            form.AddField(field);
            pdfDoc.Close();
            NUnit.Framework.Assert.IsNull(new CompareTool().CompareByContent(destinationFolder + "writeUtf8FieldNameAndValue.pdf"
                                                                             , sourceFolder + "cmp_writeUtf8FieldNameAndValue.pdf", destinationFolder, "diffFieldNameAndValue_"));
        }