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Itext PDF Image

I am trying to add a signature to the 2nd page of a PDF Form. The PDF was created outside of IText, but it has fields that were populated using IText in C#/MVC. That part works fine.
The issue is getting the signature image to the 2nd page. I can get the image onto the 1st page and position it, but cannot get it to the 2nd page.
I have tried to using the var PdfDocument class' GetPage(x) method without any luck. I have also tried to use GetLastPage(). No luck.
I tried the above approach before flattening the fields and after but no luck.
PdfReader reader = new PdfReader(fileSource);
System.IO.MemoryStream m = new System.IO.MemoryStream();
PdfWriter writer = new PdfWriter(m);
PdfDocument pdf = new PdfDocument(reader, writer);
Document document = new Document(pdf);
PdfAcroForm form = PdfAcroForm.GetAcroForm(pdf, true);
String imageFile = "C:/Temp/signature.png";
ImageData data = ImageDataFactory.Create(imageFile);
Image img = new Image(data);
img.SetFixedPosition(50, 50);
pdf.GetPage(2);
document.Add(img);
form.FlattenFields();
document.Close();
pdf.Close();
pdfBytes = m.ToArray();
return new FileContentResult(pdfBytes, "application/pdf");
Any help would be appreciated.

Generate PDF Xamarin.Forms NotImplementedException

I am trying to generate a PDF from a Xamarin.Forms application.
In the IOS simulator, I get System.NotImplementedException on document.Add function
Code:
PdfDocument pdf = new PdfDocument(new PdfWriter(filenamepdf));
Document document = new Document(pdf);
String line = "Hello! Welcome to iTextPdf";
document.Add(new Paragraph(line));
document.Close();
How should IText be used on Xamarin?
IText version: 7.1.13

You forgot to open the doc
PdfDocument pdf = new PdfDocument(new PdfWriter(filenamepdf));
Document document = new Document(pdf);
document.Open();
......
document.Close();

How to insert barcode into PDF created by IText7 HtmlConverter.ConvertToDocument method

I'm using IText 7 to convert my HTML file into PDF and auto download the file when users click a button.
Currently I'm planning to insert a barcode using IText7 into the PDF file, however I encountered some error. Btw, it works fine without the 'barcode code'.
This is the error : 'iText.Kernel.PdfException: 'Pdf indirect object belongs to other PDF document. Copy object to current pdf document.''
How can I add a barcode at the end of my pdf file?
public MemoryStream GetCovidFormPdfByAccessionNumber(string htmlFile, string accessionNumber)
{
var workStream = new MemoryStream();
using (var pdfWriter = new PdfWriter(workStream))
{
pdfWriter.SetCloseStream(false);
var pdfDoc = new PdfDocument(pdfWriter);
using (var document = HtmlConverter.ConvertToDocument(htmlFile, pdfWriter))
{
document.Add(CreateBarcode(accessionNumber, pdfDoc));
}
}
workStream.Position = 0;
return workStream;
}
private static Image CreateBarcode(string code, PdfDocument pdfDoc)
{
Barcode39 barcode = new Barcode39(pdfDoc);
barcode.SetCode(code);
//Create barcode object to put it to the cell as image
PdfFormXObject barcodeObject = barcode.CreateFormXObject(ColorConstants.BLACK, ColorConstants.BLACK, pdfDoc);
var image = new Image(barcodeObject);
image.SetWidth(250);
return image;
}

How to reduce content of exists PDF page in C#?

I convert HTML to PDF, but when i look PDF it has 2 page because content is a bit longer for one page. But i want to fit content to one page.
I tried this but it doesn't help me.
PdfDocument pdf = new PdfDocument();
pdf.LoadFromFile(pdfPath);
PdfDocument newPdf = new PdfDocument();
foreach (PdfPageBase page in pdf.Pages)
{
PdfPageBase newPage = newPdf.Pages.Add(PdfPageSize.A1, new Spire.Pdf.Graphics.PdfMargins(0));
PdfTextLayout loLayout = new PdfTextLayout();
loLayout.Layout = PdfLayoutType.OnePage;
page.CreateTemplate().Draw(newPage, new PointF(0, 0), loLayout);
}
newPdf.SaveToFile(newPdfPath);

ITextSharp pdf resize and data alignment

I am using ITextSharp to convert HTML to PDF but i want the PDF to be generated of size 5cm width. I used the following code
var pgSize = new iTextSharp.text.Rectangle(2.05f, 2.05f);
Document doc = new Document(pgSize);
but it is just resizing the pdf and my data disappeared in the pdf or get hide.
How can i align the data in the center in PDF or resize the pdf? Here is my code
public void ConvertHTMLToPDF(string HTMLCode)
{
try
{
System.IO.StringWriter stringWrite = new StringWriter();
System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
StringReader reader = new StringReader(HTMLCode);
var pgSize = new iTextSharp.text.Rectangle(2.05f, 2.05f);
Document doc = new Document(pgSize);
HTMLWorker parser = new HTMLWorker(doc);
PdfWriter.GetInstance(doc, new FileStream(Server.MapPath("~") + "/App_Data/HTMLToPDF.pdf",
FileMode.Create));
doc.Open();
foreach (IElement element in HTMLWorker.ParseToList(
new StringReader(HTMLCode), null))
{
doc.Add(element);
}
doc.Close();
Response.End();
}
catch (Exception ex)
{
}
}

You are creating a PDF that measures 0.0723 cm by 0.0723 cm. That is much too small to add any content. If you want to create a PDF of 5 cm by 5 cm, you need to create your document like this:
var pgSize = new iTextSharp.text.Rectangle(141.732f, 141.732f);
Document doc = new Document(pgSize);
As for the alignment, that should be defined in the HTML, but you are using an old version of iText and you are using the deprecated HTMLWorker.
You should upgrade to iText 7 and pdfHTML as described here: Converting HTML to PDF using iText
Also: the size of the page can be defined in the #page-rule of the CSS. See Huge white space after header in PDF using Flying Saucer
Why would you make it difficult for yourself by using an old iText version, when the new version allows you to do this:
#page {
size: 5cm 5cm;
}