string sPath = Environment.GetEnvironmentVariable("systemdrive");

Console.WriteLine(sPath);

//C:

// Sample for Environment class summary

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));

    }

}

/*

This example produces results similar to the following:

(Any result that is lengthy or reveals information that should remain

secure has been omitted and marked "!---OMITTED---!".)

C:\>env0 ARBITRARY TEXT

-- Environment members --

CommandLine: env0 ARBITRARY TEXT

GetCommandLineArgs: env0, ARBITRARY, TEXT

CurrentDirectory: C:\Documents and Settings\!---OMITTED---!

ExitCode: 0

HasShutdownStarted: False

MachineName: !---OMITTED---!

NewLine:

  first line

  second line

  third line

OSVersion: Microsoft Windows NT 5.1.2600.0

StackTrace: '   at System.Environment.GetStackTrace(Exception e)

   at System.Environment.GetStackTrace(Exception e)

   at System.Environment.get_StackTrace()

   at Sample.Main()'

SystemDirectory: C:\WINNT\System32

TickCount: 17995355

UserDomainName: !---OMITTED---!

UserInteractive: True

UserName: !---OMITTED---!

Version: !---OMITTED---!

WorkingSet: 5038080

ExpandEnvironmentVariables:

  My system drive is C: and my system root is C:\WINNT

GetEnvironmentVariable:

  My temporary directory is C:\DOCUME~1\!---OMITTED---!\LOCALS~1\Temp.

GetEnvironmentVariables:

  !---OMITTED---!

GetFolderPath: C:\WINNT\System32

GetLogicalDrives: A:\, C:\, D:\

*/