C#

PrinterSettings printer = null;
foreach (string name in PrinterSettings.InstalledProperties)
{
  printer.PrinterName = name;
  if (printer.IsValid)
  {
    // Get your printer settings for each printer.
  }
}

using System;
using System.Management;
 
class Printers
{
  static void Main(string[] args)
  {
    EnumeratePrinters(args.Length > 0 ? args[0] : null);
  }
 
  static void EnumeratePrinters(string defaultName)
  {
    ManagementObject defaultPrinter = null;
    ManagementObjectSearcher searcher = new ManagementObjectSearcher(
      "select * from Win32_Printer");
    foreach (ManagementObject printer in searcher.Get())
    {
      string name = printer["Name"].ToString();
      Console.WriteLine("Printer: " + name);
      if (defaultName != null &&
        string.Compare(name, defaultName, true) == 0)
        defaultPrinter = printer;
    }
 
    if (defaultPrinter != null)
    {
      Console.WriteLine("Setting default printer to \"{0}\"",
        defaultPrinter["Name"]);
      defaultPrinter.InvokeMethod("SetDefaultPrinter", null);
    }      
  }
}