Print a document from C# application

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C#

WinForms

C#4.0

hey. i hope all will be fine.
actually what i want to do is that, i want to select a file using file dialog facility, and then print it using printdocument.print() function.
now print() does not take any parameter. how i can tell the printer to which document to print??
and i want to know, what actually happens behind the print() method.
we are not giving any file path then what is going to print after hitting OK button.
plz help me to get print(file_path+name) functionality.
here is my effort !!!

using System;
using System.Drawing.Printing;
using System.IO;
using System.Windows.Forms;


namespace InstalledAndDefaultPrinters
{
class Program
{


static void Main(string[] args)
{
   string filename="";
   foreach (string printer in PrinterSettings.InstalledPrinters)
       Console.WriteLine(printer);
   var printerSettings = new PrinterSettings();
   Console.WriteLine(string.Format("The default printer is: {0}", printerSettings.PrinterName));

   Console.WriteLine(printerSettings.PrintFileName);
   OpenFileDialog fdlg = new OpenFileDialog();
   fdlg.Title = "Open File Dialog";
   fdlg.InitialDirectory = @"C:\ ";
   fdlg.RestoreDirectory = true;
   fdlg.ShowDialog();
   Console.WriteLine(fdlg.Title);
   if (fdlg.ShowDialog() == DialogResult.OK)
   {
       filename = String.Copy(fdlg.FileName);
   }
   Console.WriteLine(filename);

   PrintDialog printdg = new PrintDialog();
   PrintDocument pd_doc = new PrintDocument();
   printdg.ShowDialog();
   if (printdg.ShowDialog() == DialogResult.OK)
   pd_doc.Print();
   }
   }
   {