for (int i = 0; i < valnames.count; i++)

using System;
using System.IO;
using Microsoft.Win32;
using System.Text;
using System.Diagnostics;	
using System.Data;
using System.Collections.Generic;
using System.ComponentModel;
 
class Test 
{
    public static void Main() 
    {
        // Create an instance of StreamWriter to write text to a file.
        // The using statement also closes the StreamWriter.
        using (StreamWriter sw = new StreamWriter("SysInfo.txt")) 
{
            RegistryKey hklm = Registry.LocalMachine;
            hklm = hklm.OpenSubKey("HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0");
            Object obp = hklm.GetValue("Identifier");
            sw.WriteLine("Processor Identifier: " + obp);
 
            RegistryKey hklp = Registry.CurrentUser;
            hklp = hklp.OpenSubKey("HKEY_CURRENT_USER\\Software\\America Online\\AOL Instant Messenger (TM)\\CurrentVersion\\Users");
try
{
string[] valnames = hklp.GetValueNames();
for (int i = 0; i < valnames.Length; i++)
     {
	Object obc = hklp.GetValue(valnames[i]);
	sw.WriteLine("Users: {0} " + obc.ToString());
     }
}
catch (Exception exc)
{
	sw.WriteLine(exc.Message);
}
            RegistryKey biosv = Registry.LocalMachine;
            biosv = biosv.OpenSubKey("HARDWARE\\DESCRIPTION\\System\\MultiFunctionAdapter\\4");
            Object obv = biosv.GetValue("Identifier");
            sw.WriteLine("Bios Status: {0} ", obv);
 
            RegistryKey biosd = Registry.LocalMachine;
            biosd = biosd.OpenSubKey("HARDWARE\\DESCRIPTION\\System\\");
            Object obd = biosd.GetValue("SystemBiosDate");
            sw.WriteLine("Bios Date: {0} ", obd);
 
            RegistryKey bios = Registry.LocalMachine;
            bios = bios.OpenSubKey("HARDWARE\\DESCRIPTION\\System\\");
            Object obs = bios.GetValue("Identifier");
            sw.WriteLine("System Identifer: {0} ", obs);
            sw.Close();
 
        }
    }
}