//C#写入/读出文本文件
string fileName = @ "c:I.txt";
StreamReader sr = new StreamReader(fileName); string str=sr.ReadLine (); sr.close();
StreamWriterrw=File.CreateText(Server.MapPath(".")+"/myText.txt");
rw.WriteLine("写入");
rw.WriteLine("abc");
rw.WriteLine(".NET笔记");
rw.Flush();
rw.Close();
//打开文本文件
StreamReadersr=File.OpenText(Server.MapPath(".")+"/myText.txt");
StringBuilderoutput=newStringBuilder();
stringrl;
while((rl=sr.ReadLine())!=null)
...{
      output.Append(rl+"");
}
lblFile.Text=output.ToString();
sr.Close();
//C#追加文件
StreamWritersw=File.AppendText(Server.MapPath(".")+"/myText.txt");
sw.WriteLine("追逐理想");
sw.WriteLine("kzlll");
sw.WriteLine(".NET笔记");
sw.Flush();
sw.Close();
//C#拷贝文件
stringOrignFile,NewFile;
OrignFile=Server.MapPath(".")+"/myText.txt";
NewFile=Server.MapPath(".")+"/myTextCopy.txt";
File.Copy(OrignFile,NewFile,true);
//C#删除文件
stringdelFile=Server.MapPath(".")+"/myTextCopy.txt";
File.Delete(delFile);
//C#移动文件
stringOrignFile,NewFile;
OrignFile=Server.MapPath(".")+"/myText.txt";
NewFile=Server.MapPath(".")+"/myTextCopy.txt";
File.Move(OrignFile,NewFile);
//C#创建目录
//创建目录c:sixAge
DirectoryInfod=Directory.CreateDirectory("c:/sixAge");
//d1指向c:sixAgesixAge1
DirectoryInfod1=d.CreateSubdirectory("sixAge1");
//d2指向c:sixAgesixAge1sixAge1_1
DirectoryInfod2=d1.CreateSubdirectory("sixAge1_1");
//将当前目录设为c:sixAge
Directory.SetCurrentDirectory("c:/sixAge");
//创建目录c:sixAgesixAge2
Directory.CreateDirectory("sixAge2");
//创建目录c:sixAgesixAge2sixAge2_1
Directory.CreateDirectory("sixAge2/sixAge2_1");