title: PdfStamper not adding new text to assisting PDF
body: <p>I am trying to add new text to an existing PDF file but it is not adding. From the code below it doesn't show any error but the text is not added.</p>
  
  <p>I have also looked at some examples below
  <a href="http://%3Chttps://stackoverflow.com/questions/3992617/itextsharp-insert-text-to-an-existing-pdf%3E" rel="nofollow noreferrer">Example1</a>
  <a href="http://%3Chttps://forums.asp.net/t/1444178.aspx?appending%20text%20in%20Existing%20Pdf%20file%20using%20C%20itextSharp%3E" rel="nofollow noreferrer">Example2</a></p>
  
  <p>Can you please guide me if there's something I am not doing it right?</p>
  
  <p><strong>This is the code am using to write text to the pdf.</strong></p>
  
  <pre><code>      else
          {
              if (document.State != DocumentState.Signed)
                  document.State = DocumentState.Signed;
  
              document.ActionedUser = user;
              document.ActionDate = DateTime.Now;
  
        //this return bytes and it changes to document.SignedFileData = memoryStream.ToArray() and that makes it to loose original data
              document.SignedFileData = response.Document.SignedFileBytes;
              #region
  
              int numberOfPages;
  
              // create a MemoryStream to write the stamping result to
              using (MemoryStream memoryStream = new MemoryStream())
              {
                  //create PdfReader object to read from the existing document
                  using (PdfReader reader = new PdfReader(document.EditedFileData))
                  // create a PdfStamper object to manipulate the PDF in the reader and write to the MemoryStream 
                  using (PdfStamper stamper = new PdfStamper(reader, memoryStream))
                  {
                      numberOfPages = reader.NumberOfPages;
                      reader.SelectPages("1-100");
  
                      // PdfContentByte from stamper to add content to the pages over the original content
                      PdfContentByte pbover = stamper.GetOverContent(numberOfPages);
                      iTextSharp.text.Font font = new iTextSharp.text.Font(null, 10, iTextSharp.text.Font.NORMAL, BaseColor.RED);
  
                      string FisrtName = "Testing";
                      string Position = "Testing";
                      string Signature = "Testing"; ;
                      string SignatureDate = DateTime.Now.ToString();
  
                      ColumnText.ShowTextAligned(pbover, Element.ALIGN_LEFT, new Phrase(FisrtName, font), 240, 715, 0);
                      ColumnText.ShowTextAligned(pbover, Element.ALIGN_LEFT, new Phrase(Position, font), 230, 628, 0);
                      ColumnText.ShowTextAligned(pbover, PdfContentByte.ALIGN_LEFT, new Phrase(Signature, font), 230, 600, 0);
                      ColumnText.ShowTextAligned(pbover, PdfContentByte.ALIGN_LEFT, new Phrase(SignatureDate, font), 230, 574, 0);
                  }
              }
  
              #endregion
              // Store the manipulated PDF in the EditedFileData property
              document.SignedFileData = memoryStream.ToArray();
  
  
              Context.SaveChanges();
              return new SignatureSoapResponse() { Success = true, Message = document.Id.ToString() };
          }
  </code></pre>
  
  <p>PDF Table
  <a href="https://i.stack.imgur.com/kOUqe.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/kOUqe.png" alt="enter image description here"></a></p>