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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.

Can I attach an image to a signed pdf document using itext 7?

I have attached an image into a signed pdf document using itext7, but the signature became invalid. Is there any solution for this
string source = #"D:\SampleProjects\itext\file\test.pdf";
string target = #"D:\SampleProjects\itext\file\tests.pdf";
string img = #"D:\SampleProjects\itext\file\sign_valid.png";
PdfDocument pdfDocument = new PdfDocument(new PdfReader(source), new PdfWriter(target));
// Document to add layout elements: paragraphs, images etc
Document document = new Document(pdfDocument);
var noofpages = pdfDocument.GetNumberOfPages();
// Load image from disk
ImageData imageData = ImageDataFactory.Create(img);
// Create layout image object and provide parameters. Page number = 1
Image image = new Image(imageData).ScaleAbsolute(100, 100).SetFixedPosition(1, 25, 25);
document.Add(image);
document.Close();

It's a feature that the signature becomes invalid when the document is changed.
So I would say the answer to your question is no.
I recommend you attach the image before the document is signed.

C#: Create PDF Form (AcroForm) using PDFsharp

How does one add a PDF Form element to a PDFsharp PdfPage object?
I understand that AcroForm is the best format for form-fillable PDF elements, but the PDFsharp library doesn't seem to allow you to create instances of the AcroForm objects.
I have been able to use PDFsharp to generate simple documents, as here:
static void Main(string[] args) {
PdfDocument document = new PdfDocument();
document.Info.Title = "Created with PDFsharp";
// Create an empty page
PdfPage page = document.AddPage();
// Draw Text
XGraphics gfx = XGraphics.FromPdfPage(page);
XFont font = new XFont("Verdana", 20, XFontStyle.BoldItalic);
gfx.DrawString("Hello, World!", font, XBrushes.Black,
new XRect(0, 0, page.Width, page.Height), XStringFormats.Center);
// Save document
const string filename = "HelloWorld.pdf";
document.Save(filename);
}
But I cannot work out how to add a fillable form element. I gather it would likely use the page.Elements.Add(string key, PdfItem item) method, but how do you make an AcroForm PdfItem? (As classes like PdfTextField do not seem to have a public constructor)
The PDFsharp forums and documentation have not helped with this, and the closest answer I found on Stack Overflow was this one, which is answering with the wrong library.
So, in short: How would I convert the "Hello World" text above into a text field?
Is it possible to do this in PDFsharp, or should I be using a different C# PDF library? (I would very much like to stick with free - and preferably open-source - libraries)

Most of the classes constructors in PdfSharp are sealed which makes it kind of difficult to create new pdf objects. However, you can create objects using it's classes to add low-level pdf elements.
Below is an example of creating a text field.
Please refer to the pdf tech specs starting on page 432 on definition of key elements
https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf
public static void AddTextBox()
{
using (PdfDocument pdf = new PdfDocument())
{
PdfPage page1 = pdf.AddPage();
double left = 50;
double right = 200;
double bottom = 750;
double top = 725;
PdfArray rect = new PdfArray(pdf);
rect.Elements.Add(new PdfReal(left));
rect.Elements.Add(new PdfReal(bottom));
rect.Elements.Add(new PdfReal(right));
rect.Elements.Add(new PdfReal(top));
pdf.Internals.AddObject(rect);
PdfDictionary form = new PdfDictionary(pdf);
form.Elements.Add("/Filter", new PdfName("/FlateDecode"));
form.Elements.Add("/Length", new PdfInteger(20));
form.Elements.Add("/Subtype", new PdfName("/Form"));
form.Elements.Add("/Type", new PdfName("/XObject"));
pdf.Internals.AddObject(form);
PdfDictionary appearanceStream = new PdfDictionary(pdf);
appearanceStream.Elements.Add("/N", form);
pdf.Internals.AddObject(appearanceStream);
PdfDictionary textfield = new PdfDictionary(pdf);
textfield.Elements.Add("/FT", new PdfName("/Tx"));
textfield.Elements.Add("/Subtype", new PdfName("/Widget"));
textfield.Elements.Add("/T", new PdfString("fldHelloWorld"));
textfield.Elements.Add("/V", new PdfString("Hello World!"));
textfield.Elements.Add("/Type", new PdfName("/Annot"));
textfield.Elements.Add("/AP", appearanceStream);
textfield.Elements.Add("/Rect", rect);
textfield.Elements.Add("/P", page1);
pdf.Internals.AddObject(textfield);
PdfArray annotsArray = new PdfArray(pdf);
annotsArray.Elements.Add(textfield);
pdf.Internals.AddObject(annotsArray);
page1.Elements.Add("/Annots", annotsArray);
// draw rectangle around text field
//XGraphics gfx = XGraphics.FromPdfPage(page1);
//gfx.DrawRectangle(new XPen(XColors.DarkOrange, 2), left, 40, right, bottom - top);
// Save document
const string filename = #"C:\Downloads\HelloWorld.pdf";
pdf.Save(filename);
pdf.Close();
Process.Start(filename);
}
}

iText7- Pdf action controls are getting disappear after merge

I have 2 fillable PDF. In both PDF data are different. When I merge those PDF into new PDF some action controllers get disappear.I am using itext 7.
PdfDocument destPdfDocument = new PdfDocument(new PdfWriter(Server.MapPath("~/Template/cmp_job_application_new_mrg.pdf")));
PdfDocument[] sources = new PdfDocument[] {
new PdfDocument(new PdfReader(Server.MapPath("~/Template/cmp_job_application1.pdf"))),
new PdfDocument(new PdfReader(Server.MapPath("~/Template/cmp_job_application2.pdf"))) };
PdfPageFormCopier formCopier = new PdfPageFormCopier();
foreach (PdfDocument sourcePdfDocument in sources)
{
sourcePdfDocument.CopyPagesTo(1,
sourcePdfDocument.GetNumberOfPages(), destPdfDocument, formCopier);
sourcePdfDocument.Close();
}
destPdfDocument.Close();

How to show PDF file in MigraDoc.Rendering.Forms.DocumentPreview (in WinForms)?

I have a simple questions. How can you show a PDf file by using PagePreview?
I have a full pathname document.FileName = "c:\scans\Insurance_34345.pdf";
pagePreview.Preview(document.FileName); or something...
If there another way for showing a pdf. It's okay. I want to show it on a WinForms Form.
I tried this. I don't know what I have to do...
in the Designer
private MigraDoc.Rendering.Forms.DocumentPreview dpvScannedDoc;
Part of the code
string fullPadnaam = Path.Combine(defaultPath, document.FileName);
//PdfDocument pdfDocument = new PdfDocument(fullPadnaam);
//PdfPage page = new PdfPage(pdfDocument);
//XGraphics gfx = XGraphics.FromPdfPage(page);
MigraDoc.DocumentObjectModel.Document pdfDocument = new MigraDoc.DocumentObjectModel.Document();
pdfDocument.ImagePath = fullPadnaam;
var docRenderer = new DocumentRenderer(pdfDocument);
docRenderer.PrepareDocument();
var inPdfDoc = PdfReader.Open(fullPadnaam, PdfDocumentOpenMode.ReadOnly);
for (var i = 0; i < inPdfDoc.PageCount; i++)
{
pdfDocument.AddSection();
docRenderer.PrepareDocument();
var page = inPdfDoc.Pages[i];
var gfx = XGraphics.FromPdfPage(page);
docRenderer.RenderPage(gfx, i + 1);
}
var renderer = new PdfDocumentRenderer();
renderer.Document = pdfDocument;
renderer.RenderDocument();
// MigraDoc.DocumentObjectModel.IO.DdlWriter dw = new MigraDoc.DocumentObjectModel.IO.DdlWriter("HelloWorld.mdddl");
// dw.WriteDocument(pdfDocument);
// dw.Close();
//renderer.PdfDocument.rea(outFilePath);
//string ddl = MigraDoc.DocumentObjectModel.IO.DdlWriter.WriteToString(document1);
dpvScannedDoc.Show( pdfDocument);

PDFsharp does not render PDF files. You cannot show PDF files using the PagePreview.
If you use the XGraphics class for drawing then you can use shared code that draws on the PagePreview and on PDF pages.
The PagePreview sample can be found in the sample package and here:
http://www.pdfsharp.net/wiki/Preview-sample.ashx
If you have code that creates a new PDF file using PDFsharp then you can use the PagePreview to show on screen what you would otherwise draw on PDF pages. You cannot draw existing PDF pages using the PagePreview because PDF does not render PDF.

The MigraDoc DocumentPreview can display MDDDL files (your sample code creates a file "HelloWorld.mdddl"), but it cannot display PDF files.
If the MDDDL uses PDF files as images, they will not show up in the preview. They will show when creating a PDF from the MDDDL.