using System;

using System.IO;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        File.WriteAllText("someFile", "line one \nline two \nline three\n");

        var res = File.ReadAllText("someFile");

        Console.Write("File contents - " + res);

        var res_ = File.ReadAllLines("someFile");

        Console.Write("File contents - " + res_[0]);

        res_ = File.ReadLinesAsync("someFile");

        Console.Write("File contents - " + res_[0]);

    }

}