How to update the value of PDF form text field without creating new file

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C#

PDF

Hi,

Could you please help me in the following scenario.

I have editable pdf form, and want to update the field programmatically (C#) without creating new file. I tried using iTextSharp but its allowing me to read and write file simultaneously.

Do you guys have any idea how i can achieve this. Any help will be much appreciated.

Thanks in advance.

What I have tried:

string Scr = @"D:\temp\notifications\ReadFrom\pdfSource.pdf";
            string Dst = @"D:\temp\notifications\WriteTo\PdfDestination.pdf";


            try
            {

                PdfReader reader = new PdfReader(Scr);  //Source File
                using (FileStream ms = new FileStream(Dst, FileMode.OpenOrCreate, FileAccess.ReadWrite))  // Destination File Location
                {
                    PdfStamper st = new PdfStamper(reader, ms);
                    AcroFields fds = st.AcroFields;
                    var keys = fds.Fields.Keys;

                    
                    foreach (string item in keys)
                    {
                        if (item.Contains(FieldName)) // && item.GetValue(FieldName) != DBValue
                        {
                            fds.SetField(item, UserEnteredFieldValue);
                            //int i = fds.GetRevision(item);
                        }
                    }
                    
                    st.FormFlattening = true;
                    st.Writer.CloseStream = false;
                    st.Close();
                }
            }
            catch (Exception ex)
            { }