میتونید چک کنید پرینتر فعال است یا خیر

using System;
using System.Management; 
namespace zedilabs.com
{
 class PrinterOffline
 {
  [STAThread]
  static void Main(string[] args)
  {
   // Set management scope
   ManagementScope scope = new ManagementScope(@"\root\cimv2");
   scope.Connect();

   // Select Printers from WMI Object Collections
   ManagementObjectSearcher searcher = new 
    ManagementObjectSearcher("SELECT * FROM Win32_Printer");

   string printerName = "";
   foreach (ManagementObject printer in searcher.Get()) 
   {
    printerName = printer["Name"].ToString().ToLower();
    if (printerName.Equals(@"hp deskjet 930c"))
    {
     Console.WriteLine("Printer = " + printer["Name"]); 
     if (printer["WorkOffline"].ToString().ToLower().Equals("true"))
     {
      // printer is offline by user
      Console.WriteLine("Your Plug-N-Play printer is not connected.");
     }
     else
     {
      // printer is not offline
       Console.WriteLine("Your Plug-N-Play printer is connected.");
     }
    }
   }
  }
 }
}

منبع