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Program 1

using System;
using System.IO;
using System.Text;

public class TextWriterProg{

  public static void Main(){
    string str =      "A  u    i  ",                                   
           strEquiv = "A \u00E6 u \u00E5 \u00E6 \u00F8 i \u00E6 \u00E5";
  
    TextWriter                                                               
      tw1 = new StreamWriter(                         // Iso-Latin-1
             new FileStream("f-iso.txt", FileMode.Create),
             Encoding.GetEncoding("iso-8859-1")),                            

      tw2 = new StreamWriter(                         // UTF-8
             new FileStream("f-utf8.txt", FileMode.Create),
             new UTF8Encoding()),                                            

      tw3 = new StreamWriter(                         // UTF-16              
             new FileStream("f-utf16.txt", FileMode.Create),                 
             new UnicodeEncoding());                                         
                                                                             
    tw1.WriteLine(str);     tw1.WriteLine(strEquiv);                         
    tw2.WriteLine(str);     tw2.WriteLine(strEquiv);                         
    tw3.WriteLine(str);     tw3.WriteLine(strEquiv);

    tw1.Close();                                                             
    tw2.Close();
    tw3.Close();
  }

}