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Using statement to deal with multiple resources

using System; using System.Collections.Generic; using System.Text; using System.IO;              class MainClass {    static void Main()    {       using (TextWriter tw1 = File.CreateText("test.txt"),                         tw2 = File.CreateText("test2.txt"))       {          tw1.WriteLine("test");          tw2.WriteLine("test1");       }       using (TextReader tr1 = File.OpenText("test.txt"),                         tr2 = File.OpenText("test2.txt"))       {          string str;          while (null != (str = tr1.ReadLine()))             Console.WriteLine(str);                       while (null != (str = tr2.ReadLine()))             Console.WriteLine(str);       }    } } test test1