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'The specified executable is not a valid application for this OS platform

I want to print a PDF file from C# code without user interaction.
I tried this accepted answer but it is not working for me.
This is the code I tried:
Process p = new Process();
p.StartInfo = new ProcessStartInfo()
{
CreateNoWindow = true,
Verb = "print",
FileName = #"G:\Visual Studio Projects\PrintWithoutGUI\PrintWithoutGUI\Courses.pdf" //put the correct path here
};
p.Start();
I get this exception :
System.ComponentModel.Win32Exception: 'The specified executable is not a valid application for this OS platform.'`

try this by add UseShellExecute=true it will print to default printer but if you want to print to a specific print change the verb print to verb printTo by spefiying the name of the printer Arguments proprety.
private static void PrintByProcess()
{
using (Process p = new Process())
{
p.StartInfo = new ProcessStartInfo()
{
CreateNoWindow = true,
UseShellExecute=true,
Verb = "print",
FileName = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + "\\doc.pdf"
};
p.Start();
}

this is the correct way to write your code
Process p = new Process();
p.StartInfo = new ProcessStartInfo()
{
CreateNoWindow = true,
Verb = "print",
FileName = "PDfReader.exe", //put the path to the pdf reading software e.g. Adobe Acrobat
Arguments = "PdfFile.pdf" // put the path of the pdf file you want to print
};
p.Start();

Printing multiple files using process.start

Here I have code that opens Adobe and causes it to print a PDF file using Process.Start(). I am trying to print multiple files (two different pdfs) using the same command. How would I go about this? This is what I have so far:
Process profilePrintProcess = new Process();
profilePrintProcess.EnableRaisingEvents = true;
profilePrintProcess.StartInfo = new ProcessStartInfo()
{
CreateNoWindow = true,
Verb = "PrintTo",
FileName = "[" + profFileName + " " + contractFileName + "]",
WindowStyle = ProcessWindowStyle.Hidden,
};
profilePrintProcess.Start();
I've been using this link as a guide per another SO question that referenced a similar issue.

to print a single file trough Acrobat Reader try this and let me know if worked:
System.Diagnostics.Process process = new System.Diagnostics.Process();
System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
startInfo.FileName = "AcroRd32.exe";
startInfo.Arguments = "/p " + YourPDFFilePath;
process.StartInfo = startInfo;
process.Start();
to printig multipile pdf files first combine them and next print combined document trough PDFSharp
var outputPDFDocument = PdfDocument.Combine("Output.pdf", "doc1.pdf", "doc2.pdf", "doc3.pdf");
outputPDFDocument.Save("C:\\temp.pdf");
PdfFilePrinter.AdobeReaderPath = #"C:\Program Files\Adobe\Reader 8.0\Reader\AcroRd32.exe";
PdfFilePrinter.DefaultPrinterName = "Take printer";
PdfFilePrinter printer = new PdfFilePrinter(#"C:\\temp.pdf");
printer.Print();

Running exe with parameters doesn't work

var p = Process.Start(#"c:\PsTools\PsExec.exe", #"C:\Windows\System32\notepad.exe");
var err = p.StandardError.ReadToEnd();
var msg = p.StandardOutput.ReadToEnd();
lblStatusResponse.Text = "Err: " + err + "Msg: " + msg;
Why is my code not working?
I getting error:
System.InvalidOperationException: StandardError has not been redirected.
But when I add following:
p.StartInfo.RedirectStandardError = true;
var p = Process.Start(#"c:\PsTools\PsExec.exe", #"C:\Windows\System32\notepad.exe");)
it still gets the same error.
The main problem is that I wanna execute a exe with arguments, but I can't get it to work.

The following code generates a new p, this ignoring the settings you change in the previous instance:
var p = Process.Start(#"c:\PsTools\PsExec.exe", #"C:\Windows\System32\notepad.exe");)
So it doesn't really matter whether you initialize p like this
p.StartInfo.RedirectStandardError = true;
or not.
What you need to do
You need to create a ProcessStartInfo object, configure it and then pass it to Process.Start.
ProcessStartInfo p = new ProcessStartInfo(#"c:\PsTools\PsExec.exe", #"C:\Windows\System32\notepad.exe");
p.UseShellExecute = false;
p.RedirectStandardError = true;
p.RedirectStandardOutput = true;
Process proc = Process.Start(p);
var err = proc.StandardError.ReadToEnd();
var msg = proc.StandardOutput.ReadToEnd();

Taken from MSDN: https://msdn.microsoft.com/en-us/library/system.diagnostics.process.standardoutput(v=vs.110).aspx
The StandardOutput stream has not been defined for redirection; ensure ProcessStartInfo.RedirectStandardOutput is set to true and ProcessStartInfo.UseShellExecute is set to false.
So remember to set those flags as instructed by MS.

Process proc = new Process();
proc.StartInfo.FileName = "cmd.exe";
proc.StartInfo.UseShellExecute = false;
proc.StartInfo.RedirectStandardError = true;
proc.StartInfo.RedirectStandardOutput = true;
proc.StartInfo.Arguments = "/C " + command; //Enter your own command
proc.Start();
string output =proc.StandardOutput.ReadToEnd();

I know this is not the same code you have but this is was the only working code I have , that will run external command/process in C# , and return all of it output/errors to the application main window
public void Processing()
{
//Create and start the ffmpeg process
System.Diagnostics.ProcessStartInfo psi = new ProcessStartInfo("ffmpeg")
{ // this is fully command argument you can make it according to user input
Arguments = "-y -i '/mnt/Disk2/Video/Antina03.jpg' pp.mp4 ",
RedirectStandardOutput = true,
WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden,
UseShellExecute = false,
RedirectStandardError=true,
RedirectStandardInput=true
};
System.Diagnostics.Process ischk;
ischk = System.Diagnostics.Process.Start(psi);
ischk.WaitForExit();
////Create a streamreader to capture the output of ischk
System.IO.StreamReader ischkout = ischk.StandardOutput;
ischk.WaitForExit();
if (ischk.HasExited) // this condition very important to make asynchronous output
{
string output = ischkout.ReadToEnd();
out0 = output;
}
/// in case you got error message
System.IO.StreamReader iserror = ischk.StandardError;
ischk.WaitForExit();
if (ischk.HasExited)
{
string output = iserror.ReadToEnd();
out0 = output;
}
}
if you want to run this process just call the function Processing() BTW out0 are global variable so it can use out the function .
credit
I'm using MonoDevlop "C# devloping tool on Linux " and I get the output this way :-
public MainWindow() : base(Gtk.WindowType.Toplevel)
{
Build();
Processing();
textview2.Buffer.Text = out0;
}

can not get out put from pg_dump.exe command line

i'm developing an application to get backup from my postgreSQL database with C#.
i,m using code below to execute and get out put from pg_dump.exe.
ProcessStartInfo startinfo = new ProcessStartInfo
{
FileName = "\"C:\\Program Files (x86)\\pgAdmin III\\1.16\\pg_dump.exe\"",
Arguments = "--host XXX.XXX.XXX.XXX --port 5432 --username \"USERNAME\" --no-password --format plain --verbose --file \"D:\\MYBACKUP.backup\" \"MYDBNAME\"",
UseShellExecute = false,
RedirectStandardOutput = true,
CreateNoWindow = true
};
Process proc = new Process();
proc.StartInfo = startinfo;
proc.Start();
while (!proc.StandardOutput.EndOfStream)
{
var r = proc.StandardOutput.ReadLine();
}
proc.WaitForExit();
Console.WriteLine(proc.ExitCode);
Console.ReadLine();
but proc.StandardOutput.ReadLine always returns null!!!
i try to put pg_dump.exe output to a file with command propt like this:
C:\Program Files (x86)\pgAdmin III\1.16>pg_dump.exe > d:\log.txt
but again log.txt is empty!!
thanks in advance.

Replace RedirectStandardOutput with RedirectStandardError.
My working code is:
ProcessStartInfo startinfo = new ProcessStartInfo
{
FileName = "Path to pg_dump.exe",
Arguments = "Arguments",
UseShellExecute = false,
RedirectStandardError = true,
CreateNoWindow = true
};
using (Process process = Process.Start(startinfo))
{
using (StreamReader reader = process.StandardError)
{
StreamWriter sw = new StreamWriter(#"C:\log.txt");
sw.WriteLine(reader.ReadToEnd());
sw.Close();
}
}

Running / spawning commands vs files in c#

I can in C# do the following:
var pSpawn = new Process
{
StartInfo = { WorkingDirectory = #"C:\temp", FileName = fileToRun, CreateNoWindow = true }
};
pSpawn.Start();
and this works fine.... however I am wondering if there is a way to run a command (ie: "dir /b") without having to encapsulate it in a batch file?

Just start the cmd.exe and pass the arguments required
var pSpawn = new Process
{
StartInfo =
{
WorkingDirectory = #"C:\temp",
FileName = "cmd.exe",
Arguments ="/K dir /b" }
};
pSpawn.Start();
I have added the parameter /K to leave the command window open so, it is possible to see the output of the command dir.
Of course I think that you are really interested to catch the output of the command.
In this case you could work with something like this:
StringBuilder sb = new StringBuilder();
var pSpawn = new Process
{
StartInfo =
{
WorkingDirectory = #"C:\temp",
FileName = "cmd.exe",
Arguments ="/c dir /b",
CreateNoWindow = true,
RedirectStandardOutput = true,
RedirectStandardInput = true,
UseShellExecute = false
}
};
pSpawn.OutputDataReceived += (sender, args) => sb.AppendLine(args.Data);
pSpawn.Start();
pSpawn.BeginOutputReadLine();
pSpawn.WaitForExit();
Console.WriteLine(sb.ToString());

You can call something like this:
ProcessStartInfo info = new ProcessStartInfo("cmd.exe");
info.Arguments = "/c dir /b";
Process.Start(info);