Rename font in PDF using itextsharp

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C#

itextsharp

Hi I would like to replace a type1 font (Embedded subset) name and I tried to replace font name in fontfile3 stream but still its not achieved

PdfName baseFont = dict.GetAsName(PdfName.BASEFONT);            
        if (baseFont.GetBytes()[7] == '+')
        {
            string rename = baseFont.ToString().Substring(8);

            string temp = baseFont.ToString().Replace(rename, "Changed" + cnt).Replace("/", "");
            baseFont = new PdfName(temp);                
            dict.Put(PdfName.BASEFONT, baseFont);
            cnt++;
        }

        PdfDictionary fontDescriptor = dict.GetAsDict(PdfName.FONTDESCRIPTOR);
        PdfDictionary Encoding = dict.GetAsDict(PdfName.ENCODING);


        if (fontDescriptor == null)
            return;
        fontDescriptor.Put(PdfName.FONTNAME, baseFont);
 PRStream stream = (PRStream)fontDescriptor.GetAsStream(PdfName.FONTFILE3);
byte[] data = PdfReader.GetStreamBytes(stream);
var str = System.Text.Encoding.Default.GetString(data);
                byte[] myByte = System.Text.Encoding.Default.GetBytes(str.Replace("OldName", "NewName"));
 PdfStream NewStream = new PdfStream(myByte);
                PdfIndirectObject objref = stamper.Writer.AddToBody(NewStream);
fontDescriptor.Put(PdfName.FONTFILE3, objref.IndirectReference);

by using the above code i am able to change the font name in acrobat document property.
but old name remain same when i select the text using edit text in acrobat 10