using System;using System.Collections.Generic;using System.Text;using System.IO; namespace _5_71{    class Program    {        static void Main(string[] args)        {            string path = @"E:\c#\c#_net\15_71\test.txt";            //appendtext();            if (!File.Exists(path))                                                 {                // Create a file to write to.                using (StreamWriter sw = File.CreateText(path))                 {                    sw.WriteLine("Hello");                    sw.WriteLine("And");                    sw.WriteLine("Welcome");                }            }             // This text is always added, making the file longer over time            // if it is not deleted.            using (StreamWriter sw = File.AppendText(path))            {                sw.WriteLine("This");                sw.WriteLine("is Extra");                sw.WriteLine("Text");            }             // Open the file to read from.            using (StreamReader sr = File.OpenText(path))            {                string s = "";                while ((s = sr.ReadLine()) != null)                {                    Console.WriteLine(s);                }            }         }       }}

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