Development Class C#

using System;
using System.Collections;
class Sample 
{
    public static void Main() 
    {
        String str;
        String nl = Environment.NewLine;
        Console.WriteLine("CommandLine: {0}", Environment.CommandLine);
        String[] arguments = Environment.GetCommandLineArgs();
        Console.WriteLine("GetCommandLineArgs: {0}", String.Join(", ", arguments));
        Console.WriteLine("CurrentDirectory: {0}", Environment.CurrentDirectory);
        Console.WriteLine("ExitCode: {0}", Environment.ExitCode);
        Console.WriteLine("HasShutdownStarted: {0}", Environment.HasShutdownStarted);
        Console.WriteLine("MachineName: {0}", Environment.MachineName);
        Console.WriteLine("NewLine: {0}  first line{0}  second line{0}  third line",Environment.NewLine);
        Console.WriteLine("OSVersion: {0}", Environment.OSVersion.ToString());
        Console.WriteLine("StackTrace: '{0}'", Environment.StackTrace);
        Console.WriteLine("SystemDirectory: {0}", Environment.SystemDirectory);
        Console.WriteLine("TickCount: {0}", Environment.TickCount);
        Console.WriteLine("UserDomainName: {0}", Environment.UserDomainName);
        Console.WriteLine("UserInteractive: {0}", Environment.UserInteractive);
        Console.WriteLine("UserName: {0}", Environment.UserName);
        Console.WriteLine("Version: {0}", Environment.Version.ToString());
        Console.WriteLine("WorkingSet: {0}", Environment.WorkingSet);
        String query = "My system drive is %SystemDrive% and my system root is %SystemRoot%";
        str = Environment.ExpandEnvironmentVariables(query);
        Console.WriteLine("ExpandEnvironmentVariables: {0}  {1}", nl, str);
        Console.WriteLine("GetEnvironmentVariable: {0}  My temporary directory is {1}.", nl,Environment.GetEnvironmentVariable("TEMP"));
        Console.WriteLine("GetEnvironmentVariables: ");
        IDictionary  environmentVariables = Environment.GetEnvironmentVariables();
        foreach (DictionaryEntry de in environmentVariables){
            Console.WriteLine("  {0} = {1}", de.Key, de.Value);
        }
        Console.WriteLine("GetFolderPath: {0}", Environment.GetFolderPath(Environment.SpecialFolder.System));
        String[] drives = Environment.GetLogicalDrives();
        Console.WriteLine("GetLogicalDrives: {0}", String.Join(", ", drives));
    }
}