Use Nested using statement in CSharp

         /*from w w  w.j a v a2 s  .co  m*/

using System;
using System.IO;

class MainClass
{
   static void Main()
   {
      using (TextWriter tw1 = File.CreateText("test.txt"))
      {
         tw1.WriteLine("test");
         using (TextWriter tw2 = File.CreateText("test2.txt"))
            tw2.WriteLine("test1");    
      }

      using (TextReader tr = File.OpenText("test.txt"))
      {
         string str;

         while (null != (str = tr.ReadLine()))
            Console.WriteLine(str);

         using(TextReader tr2 = File.OpenText("test2.txt"))
            while(null != (str = tr2.ReadLine()))
               Console.WriteLine(str);
      }
   }
}