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Print XFA file to PDF without opening it

I am attempting to auto-fill/sign/print the federal i-9 form using Spire.PDF and C#. The i9 file is an XFA form and is protected and doesn't allow for signing. However, if I fill the i9 and print to PDF, then I can sign that new file.
The step I'm getting stuck on is printing the filled i9 to a PDF file without actually opening Acrobat or having direct interaction from the end-user to specify a file name. I say 'printing' because if I just save it as a PDF file it never flattens the XFA form and remains locked against signing.
So far I have automated printing of the file using this code:
Process proc = new Process();
proc.StartInfo.Verb = "PrintTo";
proc.StartInfo.FileName = filename;
proc.StartInfo.Arguments = "\"" + printername + "\"";
proc.StartInfo.UseShellExecute = true;
proc.StartInfo.CreateNoWindow = true;
proc.Start();
and I think I might be able to force use of the Microsoft Print to PDF 'printer' here, but I don't know if there's a way to specify the file name to use so that the user isn't prompted?
If I try printing using the Spire.PDF control, I am only able to get a file with the "Please wait...
If this message is not eventually replaced by the proper contents of the document, your PDF
viewer may not be able to display this type of document.." message as a result.
When the form is opened to print via Acrobat I get a popup of "This form contains incomplete or invalid information. Are you sure you want to print?" If I click Yes then I can successfully print to PDF and then I can sign that file.
So, I believe whatever data-checking is happening is causing the failure to print via code and I'm hoping those wiser than I might have some ideas of ways around this issue.
Thank you in advance for your help! If you just search for Federal i9 you should find the file I'm working with. I didn't see a space to attach a file here.
This is the code that I'm using to try to accomplish my task via the Spire.PDF control.
PdfDocument doc = new PdfDocument();
string i9path = "locationofi9file"
string newi9path = "locationoffilledi9file"
doc.LoadFromFile(i9path);
/*fill form here*/
doc.Form.IsFlatten = true;
doc.SaveToFile(newi9path, FileFormat.PDF);
doc.Close();
doc.Dispose();
doc.LoadFromFile(newi9path);
string file = "printi9";
if (System.IO.File.Exists(file))
System.IO.File.Delete(file);
string directory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
PrinterSettings settings = new PrinterSettings();
PageSettings pages = new PageSettings();
string printername = "Microsoft Print to PDF";
settings.PrinterName = printername;
settings.PrintToFile = true;
settings.PrintFileName = Path.Combine(directory, file + ".pdf");
PrintDocument printDoc = doc.PrintDocument;
printDoc.PrinterSettings = settings;
printDoc.Print();
doc.Close();
doc.Dispose();

how to print file C#

I wonder how to print any printable document such as doc/docx/txt/pdf using C# (WPF/WinForm whatever). MSDN documentation shows how to print .txt files (like this one https://msdn.microsoft.com/en-us/library/system.drawing.printing.printdocument%28v=vs.110%29.aspx?f=255&MSPPError=-2147217396). But when i'm trying to print .docx i've got XML-like text. I need to print file from directory only. I don't want to edit it etc. So i wonder i can skip few steps and send my file to printer directly, can't i?

using (var pd = new PrintDialog())
{
pd.ShowDialog();
var info = new ProcessStartInfo()
{
Verb = "print",
CreateNoWindow = true,
FileName = #"D:\Desktop\00762.pdf",
WindowStyle = ProcessWindowStyle.Hidden
};
Process.Start(info);
}

How to Notify Print status of a pdf document after print?

Is it possible to print a PDF document using 'System.Printing' Namespace? How does it differ from System.Drawing.Printing'? I want to print a document and check whether it is printed or not! Presently i use a process to print pdf as
var fileName = filepath;
ProcessStartInfo psInfo = new ProcessStartInfo();
psInfo.Arguments = "HP LaserJet P1505n";
psInfo.FileName = fileName;
psInfo.WindowStyle = ProcessWindowStyle.Hidden;
psInfo.Verb = "print";
psInfo.CreateNoWindow = false;
psInfo.UseShellExecute = true;
process = Process.Start(psInfo);
Here i cannot determine page printed or not!
How can i accomplish this? It is possible to check status of printer using Win32_Printer with System.Management namespace but not "printing" status

How to print a modified Word-template from C#? [duplicate]

This question already has answers here:
How to print a Word document from C#
(2 answers)
Closed 9 years ago.
I created a program reads a Word-template and modifies it with certain information. But now I would like to print the document without saving it.
Word.Application wordApp = new Word.Application();
Document wordDoc = new Document();
How can I print or print-preview wordDoc?

It looks like the document.PrintOut() method is what you're looking for.
Check this link for some examples.

you can use print dialog
using (PrintDialog pd = new PrintDialog())
{
pd.ShowDialog();
ProcessStartInfo info = new ProcessStartInfo(#"C:\documents\DOCNAME.DOC");
info.Verb = "PrintTo";
info.Arguments = pd.PrinterSettings.PrinterName;
info.CreateNoWindow = true;
info.WindowStyle = ProcessWindowStyle.Hidden;
Process.Start(info);
}

WkHtmlToPDF - Working with stdin and headers/footers

I'm trying to render an HTML document as PDF using wkhtmltopdf.exe, which I call from a C# web application.
The HTML document needs to have both a footer and header that recur on every page, which is possible with wkhtmltopdf by specifying --header-html <a path> as an argument.
However, the footer is rendered dynamically from a Razor view and I would rather not have to store it in a temporary file on disk and use that path, but I want to use the rendered HTML that's already in memory. That's possible for the document itself, by writing to the StandardInput stream, like so:
var wkhtml = ConfigurationManager.AppSettings["WkHtmlToPdfPath"];
var p = new Process();
p.StartInfo.CreateNoWindow = true;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.RedirectStandardError = true;
p.StartInfo.RedirectStandardInput = true;
p.StartInfo.UseShellExecute = false;
p.StartInfo.FileName = wkhtml;
p.StartInfo.Arguments = "-q -n --disable-smart-shrinking - -";
p.Start();
var stdin = p.StandardInput;
stdin.AutoFlush = true;
stdin.Write(template);
stdin.Dispose();
Is it possible to do the same thing for the header and footer HTML, namely to pass it in inline without having to resort to temporary files?
I've tried:
stdin.Write(string.Format("--footer-html {0} ", footer));
But of course, it just treats that as part of the document, not a footer.
The main reason I wanna render the footer and header dynamically as well is (mostly) caused by another issue. While it would be nice to have a dynamic header and footer, it's mostly to solve the problem that I have to link to images with an absolute path (ie: C:\templates\images\logo.png) because relative paths (ie: images/logo.png) don't work when you use stdin and just pass in a string blob of HTML, so I need to insert the absolute path through Razor at runtime.
For this issue, I've tried setting the working directory of the process to match the relative paths, but to no avail:
p.StartInfo.WorkingDirectory = #"C:\templates";
If I could solve that problem, that would resolve 90% of the issue as well.

Note sure if you solved this JulianR, and I will also assume you are in MVC(?)
If not you can ignore some of the initial code below, but I had a similar situation whereby I needed to stream output directly to wkhtmltopdf due to secure and logged in sections of a site.
Firstly in a controller you can pull in the View you need for the display with any applicable master page (that itself may use headers and footers):
var view = ViewEngines.Engines.FindView(ControllerContext, myViewName, myMasterPageLayout);
you then get a current of this view with any necessary ViewData, Tempdata, etc. and store this in a string (content below):
string content;
ViewData.Model = model;
using (var writer = new System.IO.StringWriter())
{
var context = new ViewContext(ControllerContext, view.View, ViewData, TempData, writer);
view.View.Render(context, writer);
writer.Flush();
content = writer.ToString();
writer.Close();
}
at this stage you could actually modify your output html in the string if needed - e.g. to change any local paths to full paths
With you output HTML you then just pass into wkhtmltopdf:
var p = new Process();
p.StartInfo.CreateNoWindow = true;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.RedirectStandardError = true;
p.StartInfo.RedirectStandardInput = true;
p.StartInfo.UseShellExecute = false;
//Other parameters as required
byte[] file;
try
{
p.Start();
byte[] buffer = new byte[32768];
using (System.IO.StreamWriter stdin = p.StandardInput)
{
stdin.AutoFlush = true;
stdin.Write(content);
}
using (MemoryStream ms = new MemoryStream())
{
ms.Position = 0;
p.StandardOutput.BaseStream.CopyTo(ms);
file = ms.ToArray();
}
p.StandardOutput.Close();
// wait or exit
p.WaitForExit(60000);
// read the exit code, close process
int returnCode = p.ExitCode;
}
you then have a byte array that contains your PDF content of the whole page.