.NET Framework Standard Library Annotated Reference, Volume 1: Base Class Library and Extended Numerics Library

Example

using System;
using System.Collections;
namespace Samples
{
  public class EnvironmentSample
  {
    public static void Main()
    {
      Console.WriteLine("Command line: {0}",
                        Environment.CommandLine);
      Console.WriteLine("CLR Version: {0}",
                        Environment.Version);
      string[] a = Environment.GetCommandLineArgs();
      foreach(string s in a)
        Console.WriteLine("Command Line Argument: {0}", s);
      IDictionary d = Environment.GetEnvironmentVariables();
      IDictionaryEnumerator e = d.GetEnumerator();
      while(e.MoveNext())
        Console.WriteLine("Key: {0} Value: {1}",
                          e.Key, e.Value);
    }
  }
}

The output is

 Command line: Environment CLR Version: 1.0.3705.288 Command Line Argument: Environment Key: SystemDrive Value: C: Key: USERPROFILE Value: C:\Documents and Settings\damien Key: INCLUDE ...