sætte default printerbakke programmelt

CSharp kode 

 using System;
 using System.Drawing.Printing;
 using System.Windows.Forms;
 using System.Runtime.InteropServices;
 
 namespace WindowsFormsApplication1
 {
     public partial class Form1 : Form
     {
 
         private void listAllPrinters()
         {
             foreach (var item in PrinterSettings.InstalledPrinters)
             {    
                 this.listBox1.Items.Add(item.ToString());
             }
         }
 
         private void listBox1_SelectedValueChanged(object sender, EventArgs e)
         {
             string pname = this.listBox1.SelectedItem.ToString();
             myPrinters.SetDefaultPrinter(pname);
         }
 
 
         public Form1()
         {
             InitializeComponent();
             listAllPrinters();
         }
     }
 
     public static class myPrinters
     {
         [DllImport("winspool.drv", CharSet = CharSet.Auto, SetLastError = true)]
         public static extern bool SetDefaultPrinter(string Name);
 
     }
 }