How to open a PDF file that is also a project resource?

Check this out easy to open pdf file from resource.

private void btnHelp_Click(object sender, EventArgs e)
    {            
        String openPDFFile = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + @"\HelpDoc.pdf";//PDF DOc name
        System.IO.File.WriteAllBytes(openPDFFile, global::ProjectName.Properties.Resources.resourcePdfFileName);//the resource automatically creates            
        System.Diagnostics.Process.Start(openPDFFile);             
    }   

Create a new Process:

string path = Path.Combine(Directory.GetCurrentDirectory(), "PDF-FILE.pdf");
Process P = new Process {
    StartInfo = {FileName = "AcroRd32.exe", Arguments = path}
};
P.Start();

In order for this to work, the Visual Studio setting Copy to Output Directory has to be set to Copy Always for the PDF file.