Read and write from file concept

StringWriter sw = new StringWriter();

           
            for (int i = 0; i <= 100; i++)
                sw.WriteLine(i);

           

            StringReader sr = new StringReader(sw.ToString());

           
            string s = sr.ReadLine();
            while (s != null)
            {
                s = sr.ReadLine();
                Console.WriteLine(s);
            }
            Console.ReadLine();