Environment class use to retrieve information such as command-line arguments, the exit code, environment variable settings, contents of the call stack, time since last system boot, and the version of the common language runtime. Environment class provides information about, and means to manipulate, the current environment and platform. Environment class cannot be inherited.

Syntax:-

 [ComVisibleAttribute(true)] 
public static class Environment
using System;
using System.Collections;

class Sample
{
    public static void Main()
    {
        String str;
        String nl = Environment.NewLine;
        //
        Console.WriteLine();
        Console.WriteLine("-- Environment members --");
        // Invoke this sample with an arbitrary set of command line arguments.
        Console.WriteLine("CommandLine: {0}", Environment.CommandLine);
        String[] arguments = Environment.GetCommandLineArgs();
        Console.WriteLine("GetCommandLineArgs: {0}", String.Join(", ", arguments)); 
        // <-- Keep this information secure! -->
        Console.WriteLine("CurrentDirectory: {0}", Environment.CurrentDirectory);         Console.WriteLine("ExitCode: {0}", Environment.ExitCode);
        Console.WriteLine("HasShutdownStarted: {0}", Environment.HasShutdownStarted); 
        // <-- Keep this information secure! -->
        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);         // <-- Keep this information secure! -->         Console.WriteLine("SystemDirectory: {0}", Environment.SystemDirectory);         Console.WriteLine("TickCount: {0}", Environment.TickCount); 
       // <-- Keep this information secure! -->
        Console.WriteLine("UserDomainName: {0}", Environment.UserDomainName);         Console.WriteLine("UserInteractive: {0}", Environment.UserInteractive);         // <-- Keep this information secure! --> 
        Console.WriteLine("UserName: {0}", Environment.UserName);         Console.WriteLine("Version: {0}", Environment.Version.ToString());         Console.WriteLine("WorkingSet: {0}", Environment.WorkingSet);         // No example for Exit(exitCode) because doing so would terminate this example.        // <-- Keep this information secure! -->         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));         Console.ReadKey();
    }
}

Note:- Above line of code displays a list of information about the current system environment.

Output:-