对文本文件进行读操作

using System;
 using System.IO;namespace ConsoleApplication2
 { 
 
  /// <summary>
  /// Summary description for Class2.
  /// </summary>
  public class Class1
  { 
 
   private const string FILE_NAME="MyFile.txt";
   public static void Main(String[] args)
   {   
    if(!File.Exists(FILE_NAME)) //如果不文件存在,则抛出异常
    { 
 
     Console.WriteLine("{0} does not exist!",FILE_NAME);
    }
    
    StreamReader sr=File.OpenText(FILE_NAME);
    String input;
    while((input=sr.ReadLine())!=null)
    { 
 
     Console.WriteLine(input);
    }
    Console.WriteLine("The end of the Stream has been reched.");
    sr.Close();
   }
  }
 }