//创建文件夹
Directory.CreateDirectory(Server.MapPath("a"));
Directory.CreateDirectory(Server.MapPath("b"));
Directory.CreateDirectory(Server.MapPath("c"));
//移动b到a
Directory.Move(Server.MapPath("b"), Server.MapPath("a//b"));
//删除c
Directory.Delete(Server.MapPath("c"));

//创建文件
//使用File.Create创建再复制/移动/删除时会提示：
//文件正由另一进程使用,因此该进程无法访问该文件
//改用 FileStream 获取 File.Create 
//返回的 System.IO.FileStream再进行关闭就无此问题
FileStream fs;
fs = File.Create(Server.MapPath("a.txt"));
fs.Close();
fs = File.Create(Server.MapPath("b.txt"));
fs.Close();
fs = File.Create(Server.MapPath("c.txt"));
fs.Close();
//复制文件
File.Copy(Server.MapPath("a.txt"),Server.MapPath("a//a.txt"));
//移动文件
File.Move(Server.MapPath("b.txt"),Server.MapPath("a//b.txt"));
File.Move(Server.MapPath("c.txt"),Server.MapPath("a//c.txt"));
//删除文件
File.Delete(Server.MapPath("a.txt"));

if(Directory.Exists(Server.MapPath("a")))
{
 //所有子文件夹
 foreach(string item inDirectory.GetDirectories(Server.MapPath("a")))
 {
  Response.Write("<b>文件夹：" + item +"</b><br/>");
  DirectoryInfo directoryinfo = new DirectoryInfo(item);
  Response.Write("名称："+directoryinfo.Name +"<br/>");
  Response.Write("路径："+directoryinfo.FullName +"<br/>");
  Response.Write("创建时间："+directoryinfo.CreationTime +"<br/>");
  Response.Write("上次访问时间："+directoryinfo.LastAccessTime+"<br/>");
  Response.Write("上次修改时间："+directoryinfo.LastWriteTime+"<br/>");
  Response.Write("父文件夹："+directoryinfo.Parent+"<br/>");
  Response.Write("所在根目录："+directoryinfo.Root+"<br/>");
  Response.Write("<br/>");
 }

 //所有子文件
 foreach (string item inDirectory.GetFiles(Server.MapPath("a")))
 {
  Response.Write("<b>文件：" + item +"</b><br/>");
  FileInfo fileinfo = new FileInfo(item);
  Response.Write("名称：" + fileinfo.Name +"<br/>");
  Response.Write("扩展名：" + fileinfo.Extension+"<br/>");
  Response.Write("路径：" + fileinfo.FullName+"<br/>");
  Response.Write("大小：" + fileinfo.Length+"<br/>");
  Response.Write("创建时间：" + fileinfo.CreationTime+"<br/>");
  Response.Write("上次访问时间：" + fileinfo.LastAccessTime+"<br/>");
  Response.Write("上次修改时间：" + fileinfo.LastWriteTime+"<br/>");
  Response.Write("所在文件夹：" + fileinfo.DirectoryName+"<br/>");
  Response.Write("文件属性：" + fileinfo.Attributes+"<br/>");
  Response.Write("<br/>");
 }
}

if (File.Exists(Server.MapPath("a//a.txt")))
{
 StreamWriter streamwrite = newStreamWriter(Server.MapPath("a//a.txt"));
 streamwrite.WriteLine("木子屋");
 streamwrite.WriteLine("http://www.1sucai.cn/");
 streamwrite.Write("2008-04-13");
 streamwrite.Close();
 StreamReader streamreader = newStreamReader(Server.MapPath("a//a.txt"));
 Response.Write(streamreader.ReadLine());
 Response.Write(streamreader.ReadToEnd());
 streamreader.Close();
}