How to randonly read a single line from a text file using C#?

using System;
using System.IO;
using System.Linq;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string fileName = @"D:\Input.txt";       

            Console.WriteLine(File.ReadLines(fileName).ToList()[GetRandomNumbers(1, 20)]);
            Console.ReadKey();
        }

        //generate random numbers
        private static readonly Random random = new Random();
        private static readonly object syncLock = new object();
        private static int GetRandomNumbers(int minVal, int maxVal)
        {
            lock (syncLock) return random.Next(minVal, maxVal);
        }
    }
}