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Program 1

using System;
using System.IO;

public class DirectoryInfoDemo{

  public static void Main(){
    string fileName = "directory-info.cs";    // The current source file

    // Get the DirectoryInfo of the current directory
    // from the FileInfo of the current source file 
    FileInfo fi = new FileInfo(fileName);     // This source file
    DirectoryInfo di = fi.Directory;

    Console.WriteLine("File {0} is in directory \n   {1}", fi, di);

    // Get the files and directories in the parent directory.
    FileInfo[] files = di.Parent.GetFiles();
    DirectoryInfo[] dirs = di.Parent.GetDirectories();

    // Show the name of files and directories on the console
    Console.WriteLine("\nListing directory {0}:", di.Parent.Name);
    foreach(DirectoryInfo d in dirs)
    foreach(FileInfo f in files)