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Log File by FileStream, StreamWriter and StreamReader

using System; using System.IO; class MainClass {     public static void Main()     {         string logFile = "LOGFILE.TXT";         FileStream fs = new FileStream(logFile, FileMode.OpenOrCreate, FileAccess.Write);                  StreamWriter sw = new StreamWriter(fs);         StreamReader sr = new StreamReader(fs);         sw.WriteLine("AAA");         sw.WriteLine("BBB");         while(sr.Peek() > -1)         {             Console.WriteLine(sr.ReadLine());         }         sw.Close();         sr.Close();         fs.Close();     } }