watki

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Threading;
namespace ConsoleApplication4
{
    public class Program
    {
        public static object blokada = new object();
        static void Main(string[] args)
        {

            Thread t = new Thread(new ThreadStart(CosRobi));
            Thread t1 = new Thread(new ThreadStart(ciag));
            t1.Start();
            t.Start();




            Console.ReadKey();
        }
        static void ciag()
        {
            using (StreamWriter writer = new StreamWriter("important.txt"))
            {
                writer.Write("Wątek pierwszy: słowo z małych liter");
            }
        }
        static void CosRobi()
        {
            string line;
            string line2;
                using (StreamReader reader = new StreamReader("important.txt"))
                {
                    line = reader.ReadLine();
                    Console.WriteLine(line);
                }
                line2 = line.ToUpper();

                    using (StreamWriter writer = new StreamWriter("important2.txt"))
                    {
                        writer.Write(line2);
                    }
            Console.WriteLine("Wątek drugi - słowo powinno składać się z dużych liter: {0}", line2);
        }
    }
}