using System;

using System.IO;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello1");

        fileReadWrite();

        getOnlyDirectoryName();

        string dirname = "dirName";

        createDirs(dirname);

        string[] allFiles = Directory.GetFiles(dirname, "*.*", SearchOption.AllDirectories);

​

        foreach(string s in allFiles) {

            Console.WriteLine(s);

        }

    }

    public static void createDirs(string dirName) {

        string[] fileNames = new string[] {

            @"1.txt",

            @"2.txt",

            @"a1\1.txt",

            @"a1\2.txt",

            @"a1\b2\1.txt",

            @"a1\b3\1.txt",

            @"b1\1.txt",

            @"b1\2.txt",

        };

        Directory.CreateDirectory(dirName);

        foreach(string s in fileNames) {

            File.Create(Path.Combine(dirName, s));          

        }

    }

    public static void fileReadWrite(){

        var filepath = @"C:\Users\ullasb\Desktop\testfile.txt";

        using (FileStream fs = File.Create(filepath));

        File.WriteAllLines(filepath, new string[]{ "file line 1", 

                                                   "file line 2"});

        string fileContents = File.ReadAllText(filepath);

        Console.WriteLine(fileContents);

    }

    public static void getOnlyDirectoryName() {

        var path = @"GrandParent\CloudTestWrapper\CloudTestWrapper.UnitTests.dll";

        var GetFileName = Path.GetFileName(path);

        var GetDirectoryName = Path.GetDirectoryName( path);

        var parentFolder = Path.GetFullPath(Path.Combine(Path.GetFullPath(path), @"..\.."));

        Console.WriteLine($"GetDirectoryName = {GetDirectoryName}");

        Console.WriteLine($"GetFileName = {GetFileName}");

        Console.WriteLine($"parentFolder = {parentFolder}");

    }

}