Lendo arquivos em c# usando File.ReadAllLines

UsingReadAllLines.cs

using System.Collections.Generic;
using System.IO;
using System.Linq;
using System;

class Program
{
    static void Main()
    {
        // Write a string array to a file.
    string[] stringArray = new string[]
	{
	    "cat",
	    "dog",
	    "arrow"
	};
	File.WriteAllLines("file.txt", stringArray);
    
    List<string> fileLines = File.ReadAllLines("file.txt").ToList();
    
    foreach(String s in fileLines)
        Console.WriteLine(s);
        
    }
}