谁给个详细的介绍Streamwriter和Steeamreader用法的资料或者链接，百度谷歌都用了，好多都看不懂，越详细越好！谢谢了

            //获取:\test.txt的写入流，参数true说明在文本后面追加，false为每次都覆盖
            StreamWriter sw = new StreamWriter(@"C:\test.txt", true);
            sw.Write("向文件中写入文本。。。");
            sw.WriteLine("向文件中写入一行文本。。。");
            sw.Close();//关闭流

            //获取C:\test.txt的读取流
            StreamReader sr = new StreamReader(@"C:\test.txt");
            string str = sr.ReadLine();//读取一行文本
            string allTxt = sr.ReadToEnd();//读取所有文本
            sr.Close();//关闭流

------解决方案--------------------
读取文本的最后一行的信息,代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace ConsoleApplication1
{
   class Program
   {
       static void Main(string[] args)
       {
           string line = null;
           FileStream fs = new FileStream(@"D:\test.txt", FileMode.Open);
           StreamReader sr = new StreamReader(fs);
           while(sr.Peek()!= -1)
           {
               line = sr.ReadLine();
           }
           Console.WriteLine(line);
           sr.Close();
           Console.ReadKey();
       }
   }
}