streamreader

using (StreamReader sr = new StreamReader(@"C:Documents and SettingsAdministrator桌面1.txt",Encoding.Default))
        //    {
        //        string a=sr.ReadLine();
        //        Console.Write(a);
        //    }
            using (StreamWriter sr = new StreamWriter(@"C:Documents and SettingsAdministrator桌面1.txt",true,Encoding.Default))
            {
                string s="我是个一个神";
              
                sr.Write(s);
               
            }
            Console.ReadKey();